physics chapter 19-30
A heater draws 20A when connected to a 110-V line. If the electric power costs 20 cents per kilowatt hour, the cost of running the heater for 10 hours is
$4.40.
A cello string 0.75 m long has a fundamental frequency of 220 hertz. The speed of a wave on the string is
330 m/s
Four amperes of current exist in the primary coil of a transformer. The voltage across the primary coil is 120 V. What is the power output of the secondary coil?
480 W
About how many octaves are present between 100 hertz and 1600 hertz?
5
An electric heater is rated 300W 110V. The safety fuse in the circuit can withstand 15 A of current. How many heaters can be safely operated in the circuit?
5
A certain transformer doubles input voltage. If the primary coil draws 10 A of current, then the current in the secondary coil is
5 A
The resistance of a filament that carries 2 A when a 10-V potential difference across it is
5 ohms
Ninety percent of light incident on a certain piece of glass passes through it. How much light passes through two pieces of this glass?
81%
Motor
A device that transforms electrical energy to mechanical energy
What color is fully transmitted in common window glass?
All of them
If an electric charge is shaken up and down
EMW is emitted, Electric field is changing, a magnetic field is created
When Eddie Electron experiences an electrical shock, the source of electrons composing the shock is
Eddie's body
Two charged particles attract each other with a force F. If the charges of both particles are doubled, and the distance between them also doubled, then the force of attraction will be
F.
What is the frequency of an electromagnetic wave that has a wavelength of 300,000 km
Hz
If you walk towards a mirror at a certain speed, the relative speed between you and your image is
If you walk towards a mirror at a certain speed, the relative speed between you and your image is
In units of measurement, power in watts is equal to
In units of measurement, power in watts is equal to
Which of these lamps employs semi-conductor technology?
LED *I THINK*
If sunlight were green instead of white, the most comfortable color to wear on a cold day would be
Magenta
Look at full-color photos in your textbook with a magnifying glass and you'll see inks of
Magenta, cyan, yellow, and black
When a colored light in air shines on water and is refracted, its wavelength
Shortens
How does the average speed of light in glass compare with its speed in a vacuum
The average speed of light in glass is about 67% of the speed of light in a vacuum
The magnetic fields of a pair of nearby magnets can
The magnetic fields of a pair of nearby magnets can
Light emitted by the Sun is
Unpolarized
The critical angle for a transparent material is the angle at and beyond which all light within the material at its upper surface is
When a light beam emerges from water into air, light speed
an atom is excited when one or more of its electrons
When an atom is at its highest possible energy
Which is not a color?
Which is not a color?
Which of these electromagnetic waves have the shortest wavelength?
X-rays
The complementary color of blue is
Yellow
A blueberry will look black when illuminated with
Yellow light
A galvanometer indicates
a flow of electrons.
The unit of electric charge, the coulomb, is the charge on
a specific large number of electrons.
The major difference between phosphorescent and fluorescent materials is
a time delay between excitation and de-excitation
Some light switches that glow in the dark after the lights are turned off employ
a time delay between excitation and de-excitation.
Sound waves can not travel in
a vacuum
A common source of wave motion is
a wave pattern
A standing wave occurs when
a wave reflects upon itself.
The efficiency of classroom-demonstration lasers is typically
about 1%
Superconductors are noted for their
absence of electric resistance.
Colors seen on TV results from color
addition
If three primary colors of light are to shine on a white wall to produce a white spot the primaries must be
additive
A friend says that changing electric and magnetic fields underlie the production of light.
agree with your friend
In which material does light travel fastest?
air
The energy per photon in ultraviolet light is greater than in
all of the above
When a pair of identical lamps are connected in PARALLEL
all of the above
The Doppler effect is characteristic of
all of the above choices
Radio waves travel
always much faster than sound waves
The type of radio waves that is diffracted the most around small buildings are
am
Like a transverse wave, a longitudinal wave has
amplitude, frequency, wavelength, and speed
Some of a wave's energy dissipates as heat. In time, this will reduce the wave's
amplitude.
Which light source is more energy-efficient
an LED
Surrounding every magnet is
an electric field. a magnetic field.
A current-carrying coil of wire is
an electromagnet.
The greater proportion of energy immediately converted to heat rather than light occurs in
an incandescent lamp.
The spectrum of a mercury vapor lamp under very high pressure appears as that from
an incandescent source
The function of polarizing filters in viewing 3 D slides or movies is to provide each eye
an independent left or right hand view
The function of polarizing filters in viewing 3-D slides or movies is to provide each eye
an independent left or right-hand view.
A generator armature is more difficult to rotate when supplying electric current due to
an induced magnetic field in the windings that resists change
A generator armature is more difficult to rotate when supplying electric current due to
an induced magnetic field in the windings that resists change.
An uncharged pith ball is suspended by a nylon fiber. When a negatively-charged rubber rod is brought near the pith ball, without touching, the ball
becomes polarized.
According to Huygens' principle, every point on a wave
behaves as a source of new waves.
To "spear" a blue fish with a red laser beam and compensate for refraction, aim your laser
below the sighted fish.
When spearing a fish with a regular spear, to compensate for refraction, throw your spear
below the sighted fish.
Charges on the plates of a charged capacitor reside on the surfaces
between the capacitor plates.
The high voltage that is important in a power line is high voltage
between the parallel wires of the line.
If you illuminate your green shirt with red light your shirt appears as
black
If one object blocks partial light the shadow is
blurry
refraction occurs when light passing from one medium to another
changes speed
Magnetic field lines about a current-carrying wire
circle the wire in closed loops.
The electrical force between charges is strongest when the charges are
close together.
When any two colors are add to produce white light they are called
complementary colors
A hologram is simply a
complex diffraction grating
Those bright newtons rings are
constructive interference
At a concert the oboe is playing a long steady note as you walk away from the stage at an accelerating velocity toward the rest room. The pitch of the sound that you hear is
continually decreasing
At a concert the oboe is playing a long steady note as you walk away from the stage at an accelerating velocity toward the rest room. The pitch of the sound that you hear, is
continually decreasing.
a "burning glass" used to concentrate sunlight in a tiny spot is a
converging lens
The complementary color of red is
cyan
Light of different colors in a glass prism travel at
different speeds.
The bending of light that passes around an obstacle or through a narrow slit, causing the light to spread is called
diffraction
Electromagnetism unites
electricity and magnetism.
Magnet A has twice the magnetic field strength of Magnet B and at a certain distance pulls on magnet B with a force of 100 N. The amount of force that magnet A exerts on magnet B is
exactly 100 N.
A bow wave is produced when a wave source moves
faster than the waves it produces.
A fish above the surface of water will see better in air if it has goggles that are
filled with water.
Different colors of light correspond to different light
frequencies
For FM radio, the F stands for
frequency
The energy of a photon depends on its
frequency
If an electron vibrates up and down 1000 times each second, it generates an electromagnetic wave having a
frequency of 1000 Hz
color depends on what characteristic of light
frequency, wavelength
Why green leaves are green
green light is reflected but no others
An iron core in a transformer
guides magnetic field lines.
If you double the frequency of a vibrating object, its period
halves.
The quality of a musical note has to do with its
harmonics
A laser cannot emit more energy than is put into it. But in instances where stored energy can be released in a very short time, the laser
has a greater power output than power input
Over geologic history the Earth's magnetic field
has reversed direction many times.
If you thrust a magnet into a closed loop of wire, the loop will
have a current in it.
If you break a bar magnet in half you'll
have two magnets
In a longitudinal wave the compressions and rarefactions travel
in the same direction as the wave
sound travels faster in air of the air temperature
is warm
If a material is heated until it is green hot, then
its molecules would be vibrating at nearly identical rates
The frequency of a simple pendulum is independent of its
mass
A node is a position of
minimum amplitude.
Which are consequences of different speeds of light in different media
mirages, brilliant colors of diamonds, rainbows
sun light is
mixed frequency light, unpolarized light, transverse light
When two lamps are connected in SERIES to a battery, the electrical resistance that the battery senses is
more than the resistance of either lamp
The electric field inside the dome of a Van de Graaff generator
neither of these.
When you are in the shadow of the earth it is
night
An inventor proposes to equip an office with a polarized source of background music and polarizing earplugs for non-listeners. His idea is
nonsense because sound cannot be polarized.
Two charged particles held close to each other are released. As the particles move, the velocity of each increases. Therefore, their charges have
not enough information given.
Materials that do not transmit visible light are said to be
opaque
White-light LEDs employ
phosphors
As a solid is gradually heated, it first glows
red
A main difference between gravitational and electric forces is that electrical forces
repel or attract.
When ultraviolet light is incident upon glass, atoms in the glass
resonate.
Helium was first discovered in the
sun
Rainbows are not usually seen as complete circles because
the ground is usually in the way
The primary of a transformer is the coil connected to
the input power line.
Compared to the primary voltage, the secondary voltage can be
the same. higher. lower.
Spectral lines take the shape of vertical lines because
they are images of a vertical slit
The Doppler effect due to motion of excited atoms in a glowing gas tends to make the spectral lines slightly
thicker.
A material which light can pass in straight lines is
trasnparent
The frequency of a simple pendulum depends on
two of these
your image in a plane mirror is
virtual
when light is refracted there is a change in its
wavelength
A lamp rated 23W 120V means that it will deliver 23 W
when the voltage across it is 120 V
An object heated to twice the absolute temperature emits radiation
with twice the peak frequency
When a pair of 1-ohm resistors are connected in series, their equivalent (combined) resistance is 2 ohms, and when connected in PARALLEL is
½ ohm
A piano tuner knows that a key on the piano is tuned to the frequency of his tuning fork when he strikes them at the same time and the number of beats he hears each second is
0
If the frequency of a certain wave is 10 hertz, its period is
0.1 second.
Two charges separated by one meter exert 1-N forces on each other. If the charges are pulled to 3-m separation distance, the force on each charge will be
0.11 N.
A 60-W light bulb connected to a 120-V source draws a current of
0.5 A
A weight suspended from a spring bobs up and down over a distance of 1 meter in two seconds. Its frequency is
0.5 hertz.
An object that completes 10 vibrations in 20 seconds has a frequency of
0.5 hertz.
To see his full height, Blinky Bill who is 1 meter tall needs a mirror that is at least
0.50 m tall
The amount of current in an incandescent bulb rated 75W 120V is about
0.6 A
An electron is pushed into an electric field where it acquires a 1-V electrical potential. If two electrons are pushed the same distance into the same electric field, the electrical potential of the two electrons is
1 V.
Neon signs require about 12,000 volts to operate. If the circuit uses a 120-volt power source, the ratio of primary to secondary turns on the transformer should be
1 primary to 100 secondary.
if the speed of light in a sphere is 2.5x10^8 m/s its index of refraction is
1.2
If the speed of light in a sphere is 2 × 108 m/s, its index of refraction is
1.5.
The frequency of the second hand on a clock is
1/60 hertz.
If you use 10 J of work to push a charge into an electric field and then release the charge, as it flies past its starting position, its kinetic energy is
10 J.
If you use 10 J of work to push a coulomb of charge into an electric field, its voltage with respect to its starting position is
10 V.
A floating object oscillates up and down 2 complete cycles in 1 second as a water wave of wavelength 5 meters passes by. The speed of the wave is
10 m/s.
A step-up transformer steps up voltage by ten times. Neglecting slight losses, if 100 W of power go into the primary coil, the power coming from the secondary coil is
100 W
A 60-W and a 100-W light bulb are connected in PARALLEL to a 120-V outlet. Which bulb draws more current?
100-W bulb
A wave having a frequency of 1000 hertz vibrates at
1000 cycles per second.
Compared to a sound of 30 decibels, a sound of 60 decibels is
1000 times as intense
How many vibrations per second are associated with a 101-MHz radio wave?
101,000,000
Suppose you sound a 1056 hertz tuning fork at the same time you strike a note on the piano and hear 2 beats/second. You tighten the piano string very slightly and now hear 3 beats/second. What is the frequency of the piano string?
1059 hertz
When a 12-V battery powers a single 6-ohm lamp,
12 joules flow in the lamp each second.
The current drawn by a 1200-W toaster connected to 120 V is 10 A. The resistance of the toaster coils is
12 ohms
A step-up transformer steps up voltage by ten times. If voltage input is 120 volts, voltage output is
1200 V.
Two charges separated by one meter exert 1-N forces on each other. If the charges are pushed to 1/4 meter separation, the force on each charge will be
16 N.
A floating leaf oscillates up and down two complete cycles each second as a water wave passes by. What is the wave's frequency?
2 hertz
An object that completes 20 vibrations in 10 seconds has a frequency of
2 hertz.
A fishing-boat captain returns to port saying, "It's rough out there - the waves are 4 meters high." He probably means that the amplitude of the waves is
2 m.
The amplitude of a particular wave is 1 meter. The top-to-bottom distance of the disturbance is
2 m.
As a train of water waves goes by, a piece of cork floating on the water bobs up and down one complete cycle each second. The waves are 2 meters long. What is the speed of the wave?
2 m/s
A 4-ohm and 6-ohm resistor connected in parallel have an equivalent resistance of
2.4 ohms
The speed of light is 300 m/s. The radio frequency of 101.1 fm is 101.1 mhz. What is the wavelength of this EMW? 1m=1,000,000
2.97m
The approximate range of human hearing is
20 - 20,000Hz
A floating leaf oscillates up and down two complete cycles in one second as a water wave passes by. The wave's wavelength is 10 meters. What is the wave's speed?
20 m/s
A diver shines light upward to the surface of a smooth pond at 20° to the normal. Most light passes into the air above while the part that reflects back into the water makes an angle to the normal of
20°.
The current in two identical light bulbs connected in series is 0.25 A. The voltage across both bulbs is 110 V. The resistance of a single light bulb is
220 ohms
The voltage across the input terminals of a transformer is 120 V. The primary has 25 loops and the secondary has 50 loops. The voltage the transformer delivers is
240 V
The electric power supplied to a lamp that carries 2 A at 120 V is
240 watts
An object that completes 14 vibrations in 7 seconds has a frequency of
2Hz
A general rule for estimating the distance in kilometers between an observer and a lightning bolt is to count the number of seconds between seeing the lightning and hearing it, and dividing by
3
A wave oscillates up and down two complete cycles each second. If the wave travels an average distance of 6 meters in one second, its wavelength is
3 m.
A skipper on a boat notices wave crests passing the anchor chain every 5 seconds. The skipper estimates the distance between crests is 15 m. What is the speed of the water waves?
3 m/s
How many colors of ink are used to print full-color pictures?
3 plus black
Two tuning forks produce sounds of wavelengths 3.4 meters and 3.3 meters. Approximately what beat frequency is produced?
3.0 hertz
Radio waves travel at the speed of light, 300,000 km/s. The wavelength of a radio wave received at 100 megahertz is
3.0 m.
The electrical force on a 2-C charge is 60 N. What is the value of the electric field at the place where the charge is located?
30 N/C
Two charges separated by one meter exert 1-N forces on each other. If the magnitude of each charge is doubled, the force on each charge is
4 N.
the amount of light reflected from the front surface of a common windowpane is about
4%
An ideal Polaroid will transmit 50% of incident sunlight. How much light will be transmitted by two ideal Polaroids oriented with their axes parallel to each other?
50%
an ideal Polaroid will transmit 50% of unpolarized light incident on it. How much light is transmitted by two ideal Polaroids that are oriented with their axes parallel to each other?
50%
A coulomb of charge flowing in a bulb filament powered by a 6-volt battery is provided with
6 joules.
A wave travels an average distance of 6 meters in one second. What is the wave's velocity?
6 m/s
The voltage across the input terminals of a transformer is 120 V. The primary has 50 loops and the secondary has 25 loops. The voltage the transformer delivers is
60 V
A 60-vibration per second wave travels 30 meters in 1 second. Its frequency is
60 hertz and it travels at 30 m/s
A 60-vibration-per-second wave travels 30 meters in 1 second. Its frequency is
60 hertz and it travels at 30 m/s.
The period of the second hand on a clock is
60 seconds.
ninety percent of light incident on a certain piece of glass passes through it. How much light passes through three pieces of this glass
73%
To say that an object is electrically polarized is to say
A balloon will stick to a wooden wall if the balloon is charged
Generator
A device that transforms mechanical energy into electrical energy
When an astronaut on the Moon experiences a solar eclipse, observers on Earth see
A lunar eclipse
The index of refraction for crown glass, common in eyeglasses, is 1.52. The index of refraction of a particular plastic lens is 1.76. Light bends more in the
A person standing waist-deep in a swimming pool appears to have short legs because of light
The type of radio waves that is diffracted the most around small buildings are
AM
argon rather than air is the gas used in incandescent bulbs because
Air contains oxygen that would react with and destroy the tungsten filament. Argon is an inert noble gas.
Wave interference occurs for
All of the above choices are correct.
The lamp most similar to the common fluorescent lamp is the
CFL
At a concert the oboe is playing a long steady note as you walk from the stage at an acceleratin velocity toward the rest room.The pitch of the sound that you hear is
Continually decreasing
Solar winds headed in Earth's direction are deviated mainly by
Earth's magnetic field.
Two charged particles repel each other with a force F. If the charge of one of the particles is doubled and the distance between them is also doubled, then the force will be
F/2.
The metal detectors that people walk through at airports operate via
Faraday's law.
Underlying the concept of self-induction is
Faraday's law.
What characteristic of light mostly relates to color?
Frequency
As we grow older, we have the greatest difficulty hearing the frequencies that are
High
When a rainbow is seen as a complete circle from an airplane, the airplane's shadow
In the center of the rainbow
Why are infrared waves often called heat waves
Infrared light vibrates entire atoms and molecules, and this vibration increases the temperature of the absorbing substance
Strictly speaking, to say that an apple is red means that
It appears red
The Sun is not seen as yellow-green because
It is a small part of a mixture of other colors in sunlight
The discovery of electromagnetic induction is credited to
Joseph Henry in America. Michael Faraday in England.
Xenon has atomic number 54, while Krypton has atomic number 36. Given that both gases are at the same temperature, in which medium does sound travel faster?
Krypton gas
If two copper wires off the same length have different thickness, then the thicker wire has . . . . Resistance.
Less
Isaac Newton first became famous for his contributions to the understanding of
Light
Two wave crests are generated at opposite ends of a long rope. Will there be an instant in which the rope's amplitude is zero everywhere?
No.
An object that completes 100 vibrations in 5 seconds has a period of
None of the above choices are correct.
As a source of continuous sound approaches a constant speed, you will be aware of an apparent increasing of its
None of the above choices are correct.
some double pane airplane windows darken when the inner pane is rotated. The panes are
Polaroid filters
Rapid change of a magnetic field induces
Rapid change of a magnetic field induces
You can get a sunburn while under the "shade" of a beach umbrella due to
Reflected sunlight from the sand
The range of electromagnetic wave from radio to gamma ray is called
Spectrum of EMW
why water has color
The blue/cyan of pure water is caused by selective absorption of red light, The blue of some lake is caused by impurity in water scattering of blue light, The surface of lake and ocean reflecting the sky results the observed color
The output power of an ideal transformer is
The output power of an ideal transformer is
electrons in the atoms of glass have natural frequency in
UV range
When a change occurs in the magnetic field in a closed loop of wire
a current is created in the loop of wire. electromagnetic induction occurs. a voltage is induced in the wire.
when you view a soap film by white light coming from almost behind your head you can see certain color. A friend on the other side of the film likely sees
a different color
When you view a soap film by white light coming from almost behind your head, you see a certain color. A friend on the other side of the film likely sees
a different color.
Which light source is more energy-efficient?
a fluorescent lamp
which light source is more energy efficient
a fluorescent lamp
for viewing tiny objects in a microscope diffraction is
a hindrance
For viewing tiny objects in a microscope, diffraction is
a hindrance.
If a guitar has no sounding board, a note played on the guitar will sound for
a longer time
At the same time an astronaut on the moon sees a solar eclipse, observers on earth see
a lunar eclipse
Surrounding every moving electron is
a magnetic field. an electric field.
An atom that absorbs a certain amount of energy can then emit
a photon of the same or lower energy
The solar radiation curve is
a plot of the Sun's brightness versus frequency of emission
The direction of an electric field is the direction of the force that it would exert on
a proton.
A transistor is an example of
a semiconductor.
Which best shields you from sunburn when at the beach
a sheet of glass between you and the Sun
Which of the following cannot travel in a vacuum?
a sound wave
The dark lines in the Sun's spectrum are due to light that is
absorbed by the Sun's atmosphere
The dark lines in the suns spectrum are due to light that is
absorbed by the sun's atmosphere.
The darkness of clouds is due to
absorption and it's often being in the shadow of another cloud
The current produced by a common generator is
ac
The principal advantage of ac power over dc power is that
ac voltage can be transformed via conventional transformers.
What produces an electromagnetic wave
accelerated electron
The electric field established by a battery in a dc circuit
acts in one direction
The speed of a sound wave in air depends on
air temperature
Magnetic fields are produced by
all moving electrical charges.
Light from a laser is
all of the above
Our eyes are not very good at seeing
all of the above
Which are consequences of different speeds of light in different media?
all of the above
Interference is a property of
all of these
Monochromatic light is light of a single
all of these
The doppler effect is a characteristic of
all of these
A single raindrop illuminated by sunshine disperses
all the colors of the rainbow
The vibrations of a longitudinal wave move in a direction
along the direction of wave travel.
To send a beam laser-light beam to a space station just above the atmosphere near the horizon, aim your laser
along your line of sight.
When voltage is induced in a coil of wire, current is
also induced.
When current reverses direction in a wire, the surrounding magnetic field
also reverses direction.
an atom that emits light of a certain frequency is
an absorber of light of the same frequency
An electric motor is very similar to
an electric generator.
Faraday's law underlies the operation of
an electric guitar. a shake flashlight. the changing of traffic lights.
Compared to the photon that enters a pane of window glass, the photon that emerges is
an identical but different photon
Isolated bells ring clearly, while bells crammed in a box have a muffled ring. This is analogous to light emitted by
an incandescent lamp
The greater proportion of energy immediately converted to heat rather than light light occurs in
an incandescent lamp
Glass is transparent to wave frequencies that
are below its natural frequencies.
When visible light is incident upon clear glass, atoms in the glass
are forced into vibration.
In the field induction credited to Maxwell, wires
are not needed
The vibrational direction of the electron and the plane of polarization of the light it emits
are the same
The vibrational direction of an electron and the plane of polarization of the light it emit
are the same.
Interference effects are less visible for thick films because the reflected waves
are too displaced to interfere
A wave barrier is produced when a wave source moves
as fast as the waves it produces.
A property of non-cubic transparent crystals is that light travels through them
at different speeds along different optic axes.
The least energy required to produce forced vibration in an object occurs
at its natural frequency
The polarization axes of glasses for 3 D viewing are
at right angles to each other
The polarization axes of glasses for 3-D viewing are
at right angles to each other.
The direction of the force exerted on a moving charge in a magnetic field is
at right angles to the direction of the motion.
The vibrations of a transverse wave move in a direction
at right angles to the direction of wave travel.
Iron absorption lines that occur in the solar spectrum indicate that iron exists in the solar
atmosphere
The source of electrons that illuminate a common lamp in your home is
atoms in the lamp filament.
Like kinds of magnetic poles repel while unlike kinds of magnetic poles
attract
An electron and a proton
attract each other.
For light a red shift indicates that the light source is moving
away from you
For light, a red shift indicates that the light source is moving
away from you
Interference colors for light are analogous to
beats for sound.
When a current-carrying wire is bent into a loop, its magnetic field inside the loop
becomes concentrated.
In the process of fluorescence, part of the input energy immediately
becomes internal energy with the rest as lower-frequency light
An uncharged pith ball is suspended by a nylon fiber. When a negatively charged rubber rod is brought nearby, without touching it, the pith ball
becomes polarized.
when a light ray passes at a non 90 degree angle from water into air it
bends away from the normal
When a light ray passes, at a non-90 degree angle, from water into air, it
bends away from the normal.
Because of absorption a Polaroid will actually transmit 40% of incident unpolarized light. Two such Polaroids with their axes aligned will transmit
between 0%-40%
A thin film Appears yellow when illuminated with white light. The other color being cancelled by destructive interference is
blue
A thin film appears yellow when illuminated with white light. The color being cancelled by destructive interference is:
blue
If molecules in the sky scattered orange light instead of blue light, sunsets would be colored
blue
The hottest star is the one that glows
blue
What color light is transmitted by a piece of blue glass?
blue
the hottest star is the one that glows
blue
Green light emitted by excited mercury vapor corresponds to an energy transition in the mercury atom. A more energetic transition might emit blue light
blue light
green light emitted by excited mercury vapor corresponds to an energy transition in the mercury atom. a more energetic transition might emit
blue light
why the sky is blue
blue light is scattered by air
A mirage occurs when light travels faster
both of these
A radio wave and a visible light wave differ only in
both of these
As monochromatic light passes from air to glass and back to air, changes occur in its
both of these
As the filament of a lamp is heated it changes
both of these
In a circuit powered by a battery, charge
both of these
Interference colors in a soap bubble give evidence that the soap film
both of these
Interference colors in a soap bubble is evidence that the soap film
both of these
Ohm's law tells us that the amount of current produced in a circuit is
both of these
Rainbows exist because light is
both of these
The electrical force between charges depends on the
both of these
The fact that you can see stars in the nighttime sky is evidence that
both of these
When sunlight illuminates a page from your Conceptual Physics book it
both of these
Every proton in the universe is surrounded by its own
both of these.
A dolphin perceives its environment
both sight and sounds
Stephanie dips a glass rod into vegetable oil. The submerged part of the rod can't be seen because
both the oil and glass have the same index of refraction.
Stephanie dips a glass rod into vegetable oil. The submerged part of the rod cant be seen because
both the oil and the glass have the same index of refraction
Normally a balloon charged to several thousand volts has a relatively small amount of
both.
To say that electric charge is conserved is to say that electric charge
can be neither created nor destroyed.
In the atoms of most materials the fields of individual electrons
cancel one another.
Whereas electric charges can be isolated, magnetic poles
cannot
An electric diode is useful for
changing ac to dc
Voltage can be induced in a wire by
changing the current in a nearby wire. moving a magnet near the wire. moving the wire near a magnet
Electric potential, measured in volts, is the ratio of electric energy to amount of electric
charge.
Which will warm up your room quicker in sunlight
clear glass window
Refraction causes the bottom of a swimming pool to appear
closer to the surface than it actually is.
Magnetic field strength about a magnet is strongest where magnetic field lines are
closer together
The spacings between double slit interference fringes is increased if the slits are
closer together
The sensation of color is seen when light falls on the eye's
cones
The sensation of color is seen when light falls on the eyes
cones
the type of lens that brings parallel light rays together is a
converging lens
the index of refraction for crown glass common in eyeglasses is 1.52 the index of refraction of a particular plastic lens is 1.36. light bends more in the
crown glass
An ampere is a unit of electric
current
Power is defined as the energy expended per unit of time. When translated to electrical terms, power is equal to
current multiplied by voltage.
If you mix blue and green lights it will yield color of
cyan
When waves from a pair of closely-spaced slits arrive out of phase
dark fringe
As more lamps are connected in a SERIES circuit, the overall current in the power source
decreases
If wavelengths of emitted light become longer, the energy per photon of light
decreases
Repeatedly tap the side of a drinking glass with a spoon while filling it with water and you will notice that the pitch of the sound
decreases
The critical angle is least in
diamond.
The principle difference between a step-up and step-down transformer is
different ratios of turns of wire for each.
When an electron passes through the magnetic field of a horseshoe magnet, the electron's
direction is changed.
To "spear" a red fish with a red laser beam and compensate for refraction, aim your laser
directly at the sighted fish.
The primary purpose of a lightning rod is to
discharge the structure to which it is attached.
Physicists find that the energy states of atoms are
discrete
Stars twinkle when seen from Earth. When seen by an astronaut on the Moon, stars
don't twinkle.
a paint pigment that absorbs red light and gives off blue light
dosent exist
To weaken a bar magnet
drop it on a hard surface. put it in hot flames. whack it with a hammer.
The device that spreads light into its component colors in a spectroscope is a
either of these.
The Doppler effect occurs when a source of sound moves
either towards you or away from you
A Doppler effect occurs when a source of sound moves
either towards you or away from you.
A balloon will stick to a wooden wall if the balloon is charged
either way.
Electromagnetic waves are composed of
electric and magnetic fields
A galvanometer can be calibrated to measure
electric current. electric voltage.
When we say an appliance "uses up electricity," we mean
electric energy dissipates into heat.
Which force field can increase a moving electron's speed?
electric field
Which force field can accelerate an electron?
electric field magnetic field
Electromagnetic induction is employed in
electric power lines. hybrid automobiles. triggering traffic lights. mobile phones.
Which force binds atoms together to form molecules?
electrical
The fundamental force underlying all chemical reactions is
electrical.
Induced electric and magnetic fields result in
electromagnetic waves.
A proton and an electron are placed in an electric field. Which undergoes the greater acceleration?
electron
Light from a lit match originates with accelerating
electrons
In an electrically neutral atom the number of protons in the nucleus is equal to the number of
electrons that surround the nucleus.
What do electric and magnetic fields contain and transport
energy
The fact that light travels only at 300,000 km/s in free space is a consequence of
energy conservation
You can touch a 100,000-volt Van de Graaff generator with little harm because although the voltage is high, the relatively small amount of charge means there is a relatively small amount of
energy.
object and image for a plane mirror occur
equal distances from the mirror
Compared to the huge force that attracts an iron tack to a strong magnet, the force that the tack exerts on the magnet is
equally huge.
An electroscope is charged positively as shown by foil leaves that stand apart. As a negative charge is brought close to the electroscope, the leaves
fall closer together.
Consider plane waves incident upon a barrier with a small opening. After passing through the opening, the waves Diffraction is more pronounced through relatively
fan out.
Plane waves incident upon a barrier that pass through a small opening
fan out.
When taking a picture of a nearby object, your camera lens should be moved
farther than one focal length from the film.
A bow wave is produced when the source of a wave moves
faster than the wave it produces
If the sun were to disappear right now, we wouldn't know about it for 8 minutes because it takes 8 minutes
for the light to travel from the sun to the earth
The speed of light is slow down in glass vs vacuum due to the process of
forced vibration, absorption and remission, collsion
A circuit breaker often serves the same purpose as a
fuse
Discrete spectral lines are observed when excitation occurs in a
gas
The extraordinary blueness in lakes in the Canadian Rockies is the result of
glacial silt in the water scattering blue light
A 100-W lamp glows brighter than a 25-W lamp. The current drawn by the 100-W lamp is
greater
An observer on the ground hears a sonic boom which is created by an airplane flying at a speed
greater than the speed of sound.
A thin film appears magenta when illuminated with white light. The color being cancelled by destructive interference is:
green
If you mix yellow and cyan paints It will yield color of
green
The shortest plane mirror in which you can see your entire image is
half your height
for radio reception diffraction is
helpful
For radio reception in city buildings, diffraction is
helpful.
For radio reception, diffraction is
helpful.
Just as water flows from a region of high pressure to a region of low pressure, electric charge flows from a region of
high electric pressure to a region of low electric pressure.
To perceive greater detail a dolphin emits sounds of
higher frequency.
A certain object emits infrared waves. If it were to emit light waves instead, its temperature would have to be
higher.
A two dimensional microscopic interference pattern that shows three D optical image is called
hologram
The glare seen from water is largely
horizontally polarized.
A mirage occurs for road surfaces that are most often
hot
every point on a wave front acting as a source of new waves is
huygens principles
In which one of these media does sound travel the fastest?
ice
A pair of crossed Polaroids will transmit light
if a third Polaroid at about 45 degrees is inserted between the two.
a mirage occurs when light travels faster
in less dense air than more dense air higher up, near the ground than higher up
sound travels faster
in steel
When a rainbow is seen as a complete circle from an airplane, the airplane's shadow is
in the center of the rainbow.
The air that you breathe doesn't emit visible light indicates that most of the electrons of its atoms are
in the ground state
The air that you breathe dosent emit visible light indicates that most of the electrons of its atom are
in the ground state.
The stride of a horse depends somewhat on the pendulum-like swing of its legs. This stride would be higher in frequency if more of the mass in its legs were concentrated
in the upper part, nearer the horse's body.
The stride of a horse depends somewhat on the pendulum like swing of its legs. The stride would be higher in frequency if more of the mass in its legs were concentrated
in the upper part,nearer the horse's body
To keep chickens in a chicken coop warm, the kind if lamp to use is
incandescent
which of these lamps has no mercury content
incandescent lamp
Light is reflected when
incident light is returned into the medium from which it came
Light from two closely-spaced stars cannot produce a steady interference pattern due to
incoherence.
Place an iron rod inside a current-carrying coil of wire and you
increase the strength of the electromagnet.
The energy of sound in air eventually becomes
increased internal energy of the air
If at a concert you run toward the orchestra, the frequency of the sound you hear will be
increased.
If at a concert, a wind blows directly from the orchestra toward you, the speed of the sound you hear will be
increased.
As more lamps are connected in a PARALLEL circuit, the overall current in the power source
increases
Heat a copper wire and its electric resistance
increases
Suppose a simple pendulum is suspended in an elevator. When the elevator is accelerating upward, the frequency of the pendulum
increases
When a light beam emerges from water into air light speed
increases
When a light beam emerges from water into air, light speed:
increases
A positive charge and a negative charge held near each other are released. As they move, the force on each particle
increases.
The part of the electromagnetic spectrum most absorbed by water is
infrared
The radiation curve for a red hot fire-place poker peaks in the
infrared region
which of the following continuously emits electromagnetic radiation
insects , radio antennas red-hot coals
The loudness of a sound is most closely related to its
intensity
diffraction is a result of
interference
the result of superposing different waves is called
interference
Holograms employ the principle of
interference, diffraction
Colors seen when gasoline forms a thin film on water are a demonstration of
interference.
Diffraction is a result of
interference.
Iridescent colors seen in the pearly luster of an abalone shell are due to
interference.
Newton's rings are a demonstration of
interference.
Newton's rings illustrate
interference.
A helium-neon laser beam in a vacuum is
invisible
Magnetic domains normally occur in
iron
To say that electric charge is quantized is to say that the charge on an object
is a whole-number multiple of the charge of one electron.
A paint pigment that absorbs blue light and gives off red light
is fluorescent or phosphorescent
A property of non-cubic transparent crystals is that polarized light that travels through them
is rotated.
The sonic boom at ground level produced by an aircraft will be reduced if the aircraft
is smaller, flies higher, and is more streamlined.
If you drop a bar magnet in a vertical copper pipe it will fall slowly because
it induces a magnetic field in the pipe that resists motion of the magnet.
Diffuse reflection occurs when the size of surface irregularities is
large compared to the wavelength of the light used.
If the waves are going by at the same frequency, the wave that has the greatest speed will have the greatest
length.
If waves are going by at the same speed, the wave with the greatest period of oscillation is the wave that has the greatest
length.
A 100-W lamp glows brighter than a 25-W lamp. The electrical resistance of the 100-W lamp is
less
Compared to its average speed in air, the average speed of a beam of light in glass is
less
Compared to the energy put into a laser the energy of the laser beam is
less
If two copper wires of the same length have different thickness, then the thicker wire has
less resistance
The drift speed of electrons that compose current in a flashlight is about
less than 1 cm/s.
The amount of light from an incandescent lamp that is transmitted through an ideal Polaroid filter is half, and through a classroom Polaroid filter is
less than half.
The amount of light from an incandescent lamp that is transmitted through an ideal Polaroid filter is half, and through a real Polaroid filter is
less than half.
according to the law of reflection the incident light ray and the normal between them
lie in the same plane
Waves diffract the most when their wavelength is
long.
Compared to ultraviolet waves, the wavelength of infrared waves is
longer
diffraction will occur if wavelength of light is
longer than opening
Magnification can be accomplished with a hologram when viewed with light that has a
longer wavelength than the original light
Atmospheric refraction makes the daylight hours a bit
longer.
A sound wave is a
longitudinal wave
Charge carriers in a metal are electrons rather than protons because electrons are
loosely bound.
When a pendulum clock at sea level is taken to the top of a high mountain, it will
lose time.
A decibel is a measure of a sound's
loudness
SOUND INTENSITY is a physiological sensation, but LOUDNESS can be measured by instruments
loudness sound intensity
The frequencies of sound that carry farther in air are
low
The spectral lines are more distinct when viewed in a mercury vapor lamp under
low pressure
Power is transmitted at high voltages because the corresponding current in the wires is
low so that overheating of the wires is minimized.
In the double-slit experiment, fringes are more widely spaced when illumination is with monochromatic
low-frequency light.
The moon would be at its fullest just before the time of a
lunar eclipse
if the moons shadow falls on part of the earth it is
lunar eclipse
A green object will appear black when illuminated with
magenta light
What is subtractive primary colors
magenta, yellow, cyan
Wood does not have magnetic properties because it contains no
magnetic domains.
Into which stable force field can a proton be placed at rest without being acted upon by a force?
magnetic field
Electromagnetic induction occurs in a coil when there is a change in
magnetic field intensity in the coil.
The force that acts between a pair of magnetic poles depends on
magnetic pole strength. separation distance.
Pigeons navigate primarily by
magnetic sensors in their heads.
Light is emitted when an electron
makes a transition to a lower energy level
Glass is opaque to wave frequencies that
match its natural frequencies, are below its natural frequencies
A current-carrying wire in a magnetic field
may be deflected. may experience a force.
An electron beam directed through a magnetic field
may experience a force. may be deflected.
A compass needle in a magnetic field
may experience a pair of torques.
The source of a sonic boom
may or may not be an emitter of sound.
A wave made with vibrating electric and magnetic filed is
microwave, light, xray
A razor blade nicely shows diffraction fringes when illuminated with
monochromatic light.
Compared to the energy of a photon of red light, the energy of a photon of blue light is
more
Connect a pair of lamps in series and current is drawn from the battery. Connect the same lamps in PARALLEL and the current drawn is
more
Compared to a single lamp connected to a battery, two lamps connected in PARALLEL to the same battery will carry
more current
What is the wavelength of an electromagnetic wave that has a frequency of 3 kilohertz?
more than 1 km
What is the wavelength of an electromagnetic wave that has a frequency of 1 hertz?
more than 1 m
What is the wavelength of an electromagnetic wave that has a frequency of 3 kilohertz
more than 1km
Magnetism is due to the motion of electrons as they
move around the nucleus. spin on their axes.
The source of all magnetism is
moving electric charge.
Compared to the energy put into a laser, the energy of the laser beam is
much less
As a supersonic aircraft increases speed, the angle of its shock wave becomes
narrower
As a supersonic craft increases in speed, the angle of its V-shaped wave becomes
narrower
As a supersonic craft increases in speed, the angle of its V-shaped shock wave becomes
narrower.
If you comb your hair and the comb becomes positively charged, then your hair becomes
negatively charged.
Rub electrons from your hair with a comb and the comb becomes
negatively charged.
The red laser beam from a helium-neon laser corresponds to a spectral line of
neon
Comparing the light from a glowing tube of neon gas and the beam of a helium-neon laser, there is a greater number of spectral lines in light from the
neon gas tube
To say that electric charge is conserved means that no case has ever been found where
net charge has been created or destroyed.
No net force acts on a loop of wire in a magnetic field when
no current is in the loop. no magnetic field lines pass through the loop.
Three-dimensional viewing was popular in the past with slide projectors. If the slides for left and right positions in the stereo projector are duplicates of each other
no depth can be seen.
Viewing exact duplicates of slides in the left and right positions of a stereo projector produces
no depth.
A current-carrying loop of wire experiences no tendency to rotate in a magnetic field when
no field lines pass through the loop.
A lamp rated at 120W 120V has a filament resistance of
none of the above
The production of interference colors requires
none of the above
We are best at hearing
none of the above choices are true
A thin film appears blue when illuminated with white light. The color being cancelled by destructive interference is
none of these
Double the frequency of sound and you also double its
none of these
When light reflects from a surface, there is a change in its
none of these
The net charge on a charged capacitor
none of these - the net charge is zero.
A conductor differs from an insulator in that a conductor
none of these.
The electric field around an isolated electron has a certain strength 1 cm from the electron. The electric field strength 2 cm from the electron is
none of these.
The atmosphere of Jupiter is more than 1000 km thick. From Jupiter's surface, the Sun at noon would appear
none of those
An inventor proposes to equip an office with a polarized source of background music and let those who prefer not to hear it wear polarizing earplugs. His idea is
nonsense - you can't polarize a sound wave.
An inventor proposes to equip an office with a polarized source of background music and let those who prefer not to hear it wear polarized earplugs. His idea is
nonsense-you cant polarize a sound wave
Several paper clips dangle from the north pole of a magnet. The induced pole in the bottom of the lowermost paper clip is a
north pole.
The conventional direction of magnetic field lines outside a magnet are from
north to south.
A wave travels an average distance of 1 meter in 1 second with a frequency of 1 hertz. Its amplitude is
not enough information to say
A jet traveling at 1500 km/hr passes between observers A and B. In a short time a sonic boom will be heard by
observers A and B, but not the pilot.
The secondary rainbow is dimmer then the primary rainbow mainly because
of an extra reflection and refraction in the drops
The unit of electrical resistance is the
ohm
A painting looks less flat when viewed with
one eye.
During a single period, the distance traveled by a wave is
one wavelength.
If you cover half a camera lens with opaque tape, the images produced will be
only dimmer.
If the primary of a transformer is connected to a dc power source, the transformer would have a voltage output
only while being connected or disconnected.
Two charged particles held close to each other are released. As they move, the force on each particle increases. Therefore, the particles have
opposite signs
Some double-pane airplane windows darken when the inner pane is rotated. The panes are
optical fibers.
Electromagnetic waves consist of
oscillating electric and magnetic fields
To say that one wave is out of phase with another is to say that the waves are
out of step.
Cosmic rays penetrate your body when
outdoors. in mountainous regions. safely in your home.
Electrons with greater potential energies relative to the atomic nucleus are
outer electrons
Neon atoms in a glass tube can be excited
over and over again
To connect a pair of resistors so their equivalent resistance (the single resistor having their combined value) will be least, connect them in
parallel
A beam of electrons can pass through a magnetic field without being deflected if the direction of the beam is
parallel to the field lines.
for absorption spectra to exist
partially absorbent material must exist between the light source and spectroscope
light will not pass through a pair of polaroids when their axes are
perpendicular
The induced electric and magnetic fields of Maxwell are
perpendicular to each other.
A beam of electrons passing through a magnetic field experiences maximum deflection if the direction of the beam is
perpendicular to the field lines.
The force a magnetic field exerts on a current-carrying wire is maximum when the wire is oriented
perpendicular to the magnetic field.
The force exerted on an electron moving in a magnetic field is maximum when the electron moves
perpendicular to the magnetic field.
Light will not pass through a pair of Polaroids when their axes are
perpendicular.
Which light-emitting process is characterized by an afterglow?
phosphorescence
The white light emitted by a fluorescent lamp is provided by the
phosphors on the inner surface of the lamp
A throbbing pulse of electromagnetic radiation is called a
photon
A source of high frequency sound emits a high
pitch
Which of the following is a property of light waves, but not of sound waves?
polarization
the light with fixed direction of vibrating electric field is
polarized light
the reflected light from the surface of snow is
polarized light, horizontally polarized, electric field parallel to surface
The intensity of cosmic rays bombarding the Earth's surface is most at the
poles
Strip electrons from an atom and the atom becomes a
positive ion.
A negatively charged rod is brought near a metal can that rests on a wood table. You touch the opposite side of the can momentarily with your finger. The can is then
positively charged.
One kilowatt is a unit of
power
The rate at which energy is transferred is
power
Voltage is most similar to
pressure
If a magnet produces a force on a current-carrying wire, the wire
produces a force on the magnet.
Earth's magnetic field is
protective to life on Earth.
A positive ion has more
protons than electrons.
When the distance between two charges is halved, the electrical force between the charges
quadruples.
Which doesn't belong to the same family?
radio waves
a rough surface for infrared waves may be polished for
radio waves
A watch dial that continues to glow after a week in the dark is almost certainly
radioactive
Light at the peak frequency of an incandescent lamp depends on the
rate of atomic and molecular vibrations
Reverberation is a case of
re-echoing of sound
when a pulse of white light is incident on a glass prism the first color to emerge is
red
Camera lenses coated with a layer of transparent material of the right thickness are almost completely non-reflective for light near the middle of the visible spectrum. They do however reflect a significant amount of
red and violet
The average speed of light is greatest in
red glass.
What is additive primary colors
red green blue
The spacing of newtons rings will be greater with
red light
The spacing of Newton's rings will be greater with
red light.
The LEDs that make up the color on some TV screens are
red, blue, green
When a pulse of white light is incident on a glass prism, the first color to emerge is
red.
On a planet where atmospheric gases are red, distant dark mountains would appear
reddish
The color of an opaque object is the same as the light that is
reflected
if a material is opaque you can see the object because the light is
reflected
rainbows exist because light is
reflected, refracted
Fermat's principle could be the principle of least distance for
reflection
The whiteness of clouds, unlike the blueness of the sky, primarily involves
reflection and refraction of sunlight
the moons redness during a lunar eclipse is due to
refracted light from earths sunrises and sunsets
The twinkling of the stars is a result of atmospheric
refraction
Huygens' principle applies mainly to:
refraction of waves in a medium and the reflection of waves
A mirage is a result of atmospheric
refraction.
When a bar magnet is thrust into a coil of copper wire, the coil tends to
repel the magnet as it enters.
A difference between electric forces and gravitational forces is that electrical forces include
repulsive interactions.
When you tune a radio to a certain station, you match the frequency of the internal electrical circuit to the frequency of the wanted radio station. In so doing you are employing the principles of
resonance
Magnetic field strength inside a current-carrying coil will be greater if the coil encloses a
rod of iron.
The magnetic field strength inside a current-carrying coil will be greater if the coil encloses a
rod of iron.
The sensation of light intensity is seen when light falls on the eyes
rods
If light in a spectroscope passed through round holes instead of slits, spectral lines would appear
round
Compressions and rarefactions normally travel in
same direction in a wave
Two lamps with different filament thicknesses, and therefore different resistances, are connected in series. Greater current is in the lamp with the
same in each
When light is reemitted in all directions light is called
scattered
The physics underlying the redness of sunsets and the color of blue jays involves
scattered sunlight
Why clouds are white
scattering all colors of sunlight by all sizes of water droplets
A variety of sunset colors is evidence for a variety of atmospheric particles
scattering different color light
Consider the interference colors seen in a film of gasoline on a wet street. The function of the water is to provide a
second reflecting surface
Consider the interference colors in a film of gasoline on a wet street. The water provides a
second reflecting surface.
Consider the interference colors seen in a film of gasoline on a wet street. The function of the water is to provide a Consider the interference colors seen in a film of gasoline on a wet street. The function of the water is to provide a
second reflecting surface.
When we say energy levels in an atom are discrete, we mean that their energy levels are well defined and
separate from one another
The safety fuse in an electric circuit is connected to the circuit in
series
Refrigerator magnets are typically
short range
the refraction of light in a diamond is greater for
short wavelength light
When long-wavelength light is seen in the interference colors of a soap bubble, the wavelength being cancelled is relatively
short.
A child swings to and fro on a playground swing. If the child stands rather than sits, the time for a to-and-fro swing is
shortened.
when a colored light in air shines on water and is refracted its wavelength
shortens
You dip your finger repeatedly into water and make waves. If you dip your finger more frequently, the wavelength of the waves
shortens.
Compared to infrared waves the wavelength of visible light waves is
shorter
The pendulum with the greatest frequency is the pendulum with the
shortest period and the shortest length.
to perceive greater detail a dolphin emits sounds of
shortest wavelength
A dolphine percieves its environment by the sense of
sight and sound
In free space, electromagnetic waves travel at a
single speed
The natural frequency of an object depends on its
size, shape and elasticity
A pendulum clock at high altitudes runs
slow.
The object with the highest natural frequency is a
small bell
Diffraction is more pronounced through relatively
small openings.
A capacitor is useful in
smoothing pulsed current.
Which of the following is not a transverse wave
sound
Which of the following is not a transverse wave?
sound
Interference is a property of
sound, light, and water waves.
A base fiddle is louder than a harp because of its
sounding board
Light refracts when traveling from air into glass because of a change in light's
speed
refraction results from differences in lights
speed
Although a magnet can change the direction of travel of an electron beam, it cannot change its
speed kinetic energy.
Chromatic aberration is a consequence of different colors in a lens having different
speeds.
if light in a spectroscope were passed through a star shaped opening instead of a thin slit spectra lines would appear as
stars
Sound travels faster in
steel
To be safe in the unlikely case of a lightning strike, it is best to be inside a building framed with
steel.
Between the consumer and the power plant, most importantly, are
step-down transformers.
Colors seen on the cover of your physics book result from color
subtraction
colors of your clothes result from color
subtraction
If the color that a surface displays depends on which parts of the visible spectrum are not absorbed and therefore remain visible color, it is called
subtractive color
A pair of sunglasses and a pair of clear reading glasses are left in the sunlight. The hotter glasses would be the
sunglasses
A superconducting magnet uses
superconducting coils.
An aircraft that flies faster than the speed of sound is said to be
supersonic.
Red sunsets are due to lower frequencies of light that
survive being scattered in the air
An excited atom is an atom
that has one or more displaced electrons
Astronomers can tell whether a light source approaches or recedes from Earth by
the Doppler effect
Information carrying nerves are connected to the retina at
the blind spot
Astronomers can detect the spin rates of stars by
the doppler effect
Two protons attract each other gravitationally and repel each other electrically. By far the greater is
the electrical repulsion.
The secondary of a transformer is the coil connected to
the load
A solar eclipse occurs when the
the moon's shadow touches Earth.
An iron rod becomes magnetic when
the net spins of many of its electrons are aligned.
The source of energy that illuminates a lamp in your home is
the power company
If you view a rainbow out your window while riding in a train, you'll see that
the rainbow moves along with you.
Compared to radio waves the velocity of visible light waves in a vacuum is
the same
Consider light energy that is momentarily absorbed in glass and then re emitted. Compared to the absorbed light, the frequency of the re emitted light is
the same
If you look at yourself in a pocket mirror, then hold the mirror farther away, you see
the same amount of yourself
When you look at yourself in a pocket mirror and then hold the mirror farther away, you see
the same amount of yourself.
When light passes through common windowpane, its angle of emergence is
the same as its angle of incidence.
The speed of light in the void between molecules in glass is
the same as its speed in a vacuum.
The force on an electron moving in a magnetic field will be least when its direction is
the same as the magnetic field direction.
In a longitudinal wave the compressions and rarefaction travel in
the same direction
In a longitudinal wave the compression and rarefaction travel in
the same direction.
Two charged particles held near each other are released. As they move, the acceleration of each decreases. Therefore, the particles have
the same sign.
light of different colors in a vacuum travel at
the same speed
Light of different colors in a vacuum travel at
the same speed.
Compared to radio waves, the velocity of visible light waves in a vacuum is
the same.
Consider light energy that is momentarily absorbed in glass and then re-emitted. Compared to the absorbed light, the frequency of the re-emitted light is
the same.
Particle A and Particle B interact with each other. Particle A has twice the charge of particle B. Compared to the force on Particle A, the force on Particle B is
the same.
Disconnect a small-voltage battery from a coil of many loops of wire and a large voltage may be produced by
the sudden collapse in the magnetic field.
light travels from one place to another along a path of least
time
A transformer transforms voltage while
transferring energy from one coil to another.
A turbogenerator
transforms energy from one form to another.
Polarization is a property of
transverse waves
In optical fibers of uniform density, light actually
travels in straight-line segments
Disregarding the effects of friction, a cyclist will coast farther when a lamp powered by a wheel generator is
turned off
When a magnet is moved to and fro in a wire coil, voltage is induced. If the coil has twice as many loops, the voltage induced is
twice
When a mirror with a fixed beam on it is rotated through a certain angle, the reflected beam is rotated through an angle that is
twice as large.
A violet-hot star emits radiation having about twice the peak frequency of radiation from a red-hot star. The surface temperature of the hotter star is about
twice that of the cooler star
A floating leaf oscillates up and down two complete cycles each second as a water wave passes by. What is the wave's frequency
two complete cycles = 2hz
the colors of a soap bubble is caused by the interference between
two reflected rays from top and bottom surfaces
What can exist in the same place at the same time?
two waves
Colors seen in the flames of a burning log originate with the variety of
types of atoms that are emitting light in the flame
Fluorescent minerals on display in museums are illuminated with
ultraviolet light.
The radiation curve for a blue hot star peaks in the
ultraviolet region
A total solar eclipse occurs for people in the Sun's
umbra
When the speed of sound near the ground is greater than it is at higher altitudes, the sound ends to be bent
upward
When the speed of sound near the ground is greater than it is at higher altitudes, the sound tends to be bent
upward
c=300,000,000 m/s is speed of light in
vacuum
The polarization axis of polarized sunglasses is
vertical
Polaroid sunglasses reduce much glare by polarization axes that are
vertical.
The source of all electromagnetic waves is
vibrating charges.
A common source of wave motion is a
vibrating object.
A wiggle in time is a
vibration.
the absorption of an infrared photon that excites an atom to emit a green photon
violates the law of energy conservation.
The dimmest part of sunlight is
violet
The highest frequency of visible light is
violet
When sunlight from air enters water light that refracts most is
violet
When sunlight from air enters water, light that refracts most is
violet.
The smallest portion of the electromagnetic spectrum is
visible light
A transformer actually transforms
voltage
An efficient step-up transformer boosts
voltage
Just as a sustained flow of water in a hydraulic circuit needs a pump, in electric circuits the flow of charge needs
voltage
Just as in hydraulic circuits there is water pressure, in electric circuits there is
voltage
One joule per coulomb is a unit of
voltage
A charged balloon neatly illustrates that something can have a great amount of
voltage and a small potential energy.
Sound travels faster in air if the air temperature is
warm
Double the frequency of sound and you halve its
wavelength
When light is refracted, there is a change in its
wavelength.
If the energy levels in the neon atom were not discrete, neon signs would glow
white
If the radiation curve for an incandescent lamp filament peaks in the green region the object would appear
white
If the radiation curve for an incandescent lamp filament peaks in the green region, the object would appear
white
If Earth's atmosphere were appreciably thicker, snow would appear:
yellow
If only one color is absorbed in the pigment of a particular blue paint, that color would be
yellow
f Earth's atmosphere were appreciably thicker, snow would appear:
yellow
A fast-moving ball is more easily seen if it is
yellow-green
The number of electrons delivered daily to an average American home by an average power utility in the early 21st century was
zero
The electric field inside an uncharged metal ball is zero. If the ball is negatively charged, the electric field inside the ball is then
zero.
When a car is struck by lightning, the resulting electric field inside the car is
zero.