physics final

Sound waves travel through air as a series of _ and _

Compressions, rarefactions

A piece of metal will feel colder than a piece of wood at the same temperature. Why? Metals, in general, have a higher specific heat capacity than wood. Metals are colder than wood. Metal atoms are moving more slowly, on the average, than wood atoms. Wood, in general, is a poor insulator. Metals, in general, are good heat conductors.

Metals, in general, are good heat conductors.

Materials that absorb light are called

Opaque

A total shadow is called an

Umbra

Which of these electromagnetic waves has the shortest wavelength Visible Light waves Ultraviolet waves X-rays Radio waves Infrared waves

X-rays

A good absorber of radiation is a good reflector. a poor emitter of radiation. a good emitter of radiation none of the above

a good emitter of radiation

When two or more waves are at the same place at the same time, the resulting effect is called a. a standing wave. b. a shock wave. c. a Doppler wave. d. interference. e. a period.

a standing wave.

Sound waves cannot travel in a. steel. b. air. c. a vacuum. d. water. e. Sound can travel in all of the above.

a vacuum

When water at 4 degrees celcius is heated it expands. When water at 4 degrees celcius is cooled it _ . a. expands b. neither expands nor contracts c. contracts

a. expands

When a metal ring is heated the hole becomes _ . a. larger b. does not change in size c. smaller

a. larger

Specific heat capacity is related to the amount of internal energy _____. a. needed to change the temperature of one gram of a substance one degree b. a specific object has c. transferred by one object d. one molecule contains e. transferred by one molecule

a. needed to change the temperature of one gram of a

Energy transmitted by electromagnetic waves is called _____ . a. radiation b. conduction c. convection

a. radiation

Colors seen on a TV result from color addition. subtraction.

addition.

Standing waves can be set up a. in organ pipes. b. by blowing across the top of a soda bottle. c. on strings of musical instruments. d. all of the above e. none of the above

all of the above

Sunsets are red because blue light from the sun is scattered by Earth's atmosphere. . a lot of high-frequency light is scattered by the atmosphere. . the longest path of sunlight through the the atmosphere is at sunset or sunrise. all of the above none of the above

all of the above

The reason sea breezes are usually from the sea toward the land during the day is that land is hotter than water. cool air high over the ocean flows downward. a high-pressure area is created high above the water. a low-pressure area is created just over the shore. all of the above

all of the above

Resonance occurs when a. sound changes speed in going from one medium to another. b. sound makes multiple reflections. c. the amplitude of a wave is amplified. d. an object is forced to vibrate at its natural frequency. e. all of the above

an object is forced to vibrate at its natural frequency.

Good conductors have a. have 3 or fewer electrons. b. "loose" outer electrons. c. "tightly bound" outer electrons. d. have no electrons.

b. "loose" outer electrons.

When blue and yellow are mixed together, the result is green. The reason for this is that yellow pigments absorb green light and reflect all the others. between blue and yellow pigments, all colors are absorbed except green. blue and yellow are complementary colors. blue absorbs yellow light and yellow absorbs blue light. blue reflects only blue light, and yellow reflects almost all colors of light.

between blue and yellow pigments, all colors are absorbed except green.

If molecules in the sky scattered orange light instead of blue light, sunsets would be colored orange yellow. blue. green.

blue.

The Doppler effect occurs when a source of sound moves a. away from you. b. toward you. c. both A and B d. none of the above

both A and B

Typical glass is transparent to visible light, but not to ultraviolet. infrared. both of the above none of the above

both of the above

Electromagnetic waves need a medium to travel through. can travel through a vacuum.

can travel through a vacuum

A sheet of red paper will look black when illuminated with yellow light. magenta light. cyan light. red light. none of the above

cyan light.

true or false Excited atoms never return to their normal state.

false

Different colors of light correspond to different light velocities. intensities. frequencies. polarities.

frequencies.

Hertz is the unit of measure for a wave's a. period b. speed c. wavelength d. frequency

frequency

Beats can be heard when two tuning forks a. are sounded together. b. have almost the same frequency and are sounded together. c. have the same frequency and are sounded together. d. all of the above e. none of the above

have almost the same frequency and are sounded together

The electromagnetic waves used to cook food are a. microwaves b. infrared waves c. ultraviolet waves d. radio waves

microwaves

The metallic coating on the glass surfaces of a Thermos vacuum bottle reduces the amount of energy transferred by radiation. conduction. convection. friction. none of the above

radiation.

Photons are a. massless b. bundles of concentrated electromagnetic energy c. the particle theory of light's dual nature d. all of the above

(all of the above)

Sound waves in air are a series of a. periodic disturbances. b. periodic condensations and rarefactions. c. high- and low-pressure regions. d. all of the above e. none of the above

(all of the above) periodic disturbances, periodic condensations, and rarefactions, high and low-pressure regions

Which has a faster speed a. radio waves b. microwaves c. visible light d. none, they all have the same speed

(d. none, they all have the same speed)

A piece of paper wrapped around a thick metal bar will not ignite when touched with a lit match because energy goes to the bar, preventing ignition temperature in the paper. the bar keeps the paper relatively cool. the bar is slow to heat up. . all of the above.

. all of the above.

The period of an ocean wave is 10 seconds. What is the wave's frequency? a. 0.10 Hz b. 5.0 Hz c. 10.0 Hz d. 20.0 Hz e. 30.0 Hz

0.10 Hz

A weight on the end of a spring bobs up and down one complete cycle every 4.0 seconds. Its frequency is a. 0.25 hertz. b. 4.0 hertz. c. none of the above.

0.25 hertz.

A 680-Hz sound wave travels at 340 m/s in air, with a wavelength of a. 0.5 m.. b. 5 m. c. 50 m. d. 500 m. e. none of the above

0.5 m

A certain ocean wave has a frequency of 0.07 hertz and a wavelength of 10 meters. What is the wave's speed? a. 143 m/s b. 10 m/s c. 0.07 m/s d. 1.0 m/s e. 0.70 m/s

0.70 m/s

A wave has two crests and two troughs each second. If the wave travels an average distance of 8 meters in 4 seconds, its wavelength is a. 20 m. b. 15 m. c. 0 m. d. 1 m. e. 10 m.

1 m.

An explosion occurs 340 m away. Given that sound travels at 340 m/s, the time the sound takes to reach you is a. 1 s. b. 10 s. c. 100 s. d.0.1 s.

1 s

Compared to the threshold of hearing (= 0 dB), a sound level of 10 decibels is a. 1 times more intense. b. 20 times more intense. c. 200 times more intense. d. 10 times more intense.

10 times more intense

Compared to a sound of 10 decibels, a sound of 50 decibels has a. 40 times the intensity. b. 400 times the intensity. c. 10,000 times the intensity.

10,000 times the intensity

A tuning fork of frequency 300 Hz will resonate if a sound wave incident on it has a frequency of a. 150 Hz. b. 600 Hz. c. both A and B d. none of the above

150 Hz

A leaf on a pond oscillates up and down two complete cycles each second as a water wave passes. What is the wave's frequency? a. 0.5 hertz b. 1 hertz c. 2 hertz d. 3 hertz e. 6 hertz

2 hertz

A wave travels an average distance of 6 meters in 3 seconds. What is the wave's velocity? a. 1 m/s b. 2 m/s c. 0.5 m/s d. 3 m/s

2 m/s

Two waves arrive at the same place at the same time exactly in step with each other. Each wave has an amplitude of 2.5 m. The resulting wave has an amplitude of

5.0 m.

A skipper on a boat notices wave crests passing the anchor chain every 6.0 seconds. The skipper estimates the distance between crests at 30.0 m. What is the speed of the water waves? a. 5.0 m/s b. 6.0 m/s c. 30.0 m/s d. not enough information given

5.0 m/s

A cork floating in a pool oscillates up and down three complete cycles in 1 second as a wave passes by. The wave's wavelength is 2 meters. What is the wave's speed? a. 1 m/s b. 2 m/s c. 6 m/s d. 12 m/s e. More than 12 m/s

6 m/s

The amplitude of a particular wave is 4.0 m. The top-to-bottom distance of the disturbance is a. 2.0 m. b. 4.0 m. c. 8.0 m. d. none of the above

8.0 m.

The reason an ocean's temperature doesn't change much from one season to the next is _ . a. water has a high specific heat capacity b. oceans are in thermal contact with larger land regions c. water has a low specific heat capacity d. oceans are located in mild regions of the Earth

:a. water has a high specific heat capacity

The transfer of energy within materials or between different a. convection b. radiation :c. conduction

:c. conduction

Where can you touch a standing wave on a rope without disturbing the wave? a. At any place along the wave b. At an antinode c. At a node

At a node

Which temperature scale labels the freezing point of water at 0 degrees? a. Celsius b. Caloric c. Kelvin d. Fahrenheit e. none of the above

Celsius

Solar eclipses are seen less commonly than lunar eclipses because the sun is so much larger than the moon. the sun is farther from Earth than is the moon. solar eclipses don't happen as often as lunar eclipses. Earth's shadow on the moon is larger than the moon's shadow on Earth. none of the above

Earth's shadow on the moon is larger than the moon's shadow on Earth.

(true or false) A wave on a rope whose motion is at right angles to the direction of wave propagation is a longitudinal wave.

False

(true or false) Ultrasonic sound waves have frequencies below 20Hz

False

(true or false) When the high part of one wave fills in the low part of another wave, constructive interference occurs.

False

(true or false)Infrasonic sound waves have frequencies above 20,000Hz.

False

In which one of the following does sound travel the fastest a. Water b. Ice c. Steam d. Sound travels at the same speed in all of the above.

Ice

Light does not pass through what kind of materials? Transparent Opaque Neither of the above

Opaque

Which of the following is NOT an electromagnetic wave? Infrared Visible Light X-Ray Radio Sound

Sound

Which of the following are fundamentally different from the others? Sound waves Light waves Radio waves X-rays Gamma rays

Sound waves

Which of the following would be most likely to transmit sound with the highest speed? a. Steel in a bridge b. Wood in a cabinet c. Water in the ocean d. Water in a swimming pool e. Air in your classroom

Steel in a bridge

Which cools at the faster rate, a pot of boiling water left at room temperature or a pot of lukewarm water the same size left at room temperature? The lukewarm water. The boiling water. Neither—the cooling rate is the same for both. .

The boiling water.

(true or false) Light that reflects at glancing angles from nonmetallic surfaces, such as glsss, water, or roads, vibrates mainly in the plane of the reflecting surface

True

(true or false) Lightr is energy emitted by accelerating electric charges

True

(true or false) Resonance is a phenomenon that occurs when the frequency of a vibration forced on an object matches the object's natural frequency and a dramatic increase in amplitude occurs

True

(true or false) Sound waves are examples of longitudinal waves.

True

(true or false) The amplitude of a wave is the vertical distance from the midpoint to either the crest or the trough of the wave.

True

(true or false) The sounding board in a string instrument produces sound by being forced to vibrate

True

(true or false) The speed of sound in solids depends on the elasticity of the solid

True

True/False A spectroscope is an instrument that analyzes the colors in a light beam.

True

True/False Material in an object that selectively absorbs colored light is called a pigment.

True

true or false Heat is the energy that moves from one object to another because of a temperature difference.

True

true or false When matter gets warmer, the atoms or molecules in the matter move faster.

True

A good reflector of radiation is a poor absorber of radiation. a good absorber of radiation. a good emitter of radiation. none of the above

a poor absorber of radiation.

The boiling temperature for water on the Fahrenheit scale is _____ degrees. a. 212t. b. 0 c. 100 d. 32

a. 212t.

The temperature at which a substance has no kenetic energy to give up is 0° _____ . a. Kelvin b. celsius c. Fahrenheit

a. Kelvin

The reason fish live from year to year in lakes that freeze during the winter is _ . a. The temperature of the water below the ice is above freezing b. fish are cold blooded and can survive being frozen and thawed c. fish hibernate during the winter d. fish swim so fast they keep the water below the ice from freezing

a. The temperature of the water below the ice is above freezing

The reason you can hold your fingers beside a candle flame without getting hurt is that air convects heat well. hot air rises. air is a poor heat conductor. . hot-air convection currents travel upward. all of the above

all of the above

If you were caught in freezing weather with only a candle for heat, you would be warmest in a tent. a car. an igloo. a wooden house.

an igloo.

The density of water is greatest _____ . a. at 10 degrees celsius b. at 0 degrees celsius c. at 100 degrees celsius d. at 4 degrees celsius

at 4 degrees celsius

The Doppler effect occurs when a source of sound moves a. away from you. b. toward you. c. both A and B d. none of the above

away from you., toward you.

Which has the higher specific heat capacity, water or sand? a. They both have the same specific heat capacity. b. Water c. Sand

b. Water

The largest extremes in temperature usually occur _ . a. only at the equator b. in inland cities like Vacaville c. on islands d. in coastal cities like San Francisco

b. in inland cities like Vacaville

The main difference between a radio wave and a sound wave is its The main difference between a radio wave and a sound wave is its frequency. wavelength. energy. amplitude. basic nature.

basic nature.

When two sounds of slightly different frequencies are sounded together, the regular fluctuation in the loudness of the combined sounds is called a. beats b. resonance c. infrasonic d. forced vibration

beats

It is not possible to create _ by combining colors of light.

black

The white caps of waves as they overturn are evidence that the water has absorbed black. broken into assortment of tiny particles that scatter all colors. lost its transparency. reflected red, green and blue light.

broken into assortment of tiny particles that scatter all colors.

The lower atmosphere is directly warmed by absorption of terrestrial radiation. by incoming solar radiation. from the weight of the atmosphere. by the emission of terrestrial radiation.

by absorption of terrestrial radiation.

Two substances in thermal contact are in thermal equilibrium when _____ . a. they reach the same temperature b. energy no longer flows while they remain in thermal contact c. Both A and B

c. Both A and B

he temperature known as "absolute zero" is 0° on the _____ scale. a. Fahrenheit b. celsius c. Kelvin

c. Kelvin

he transfer of energy within materials or between different materials that are in direct contact is called _____ . a. convection b. radiation c. conduction

c. conduction

A means of heat transfer by movement of the heated substance itself is called _____ . a. radiation b. conduction c. convection

c. convection

Internal energy is the _____. a. average amount of energy contained in an object b. amount of energy that is transferred from one object to another object :c. total amount of energy contained in an object d. amount of kinetic energy all the molecules have e. all of the above

c. total amount of energy contained in an object

At night, a sea breeze results when warm air over the shore rises and cooler air from the ocean takes its place. warm air over the ocean rises and cooler air from the shore takes its place. cool air over the shore rises and warmer air from the ocean takes its place. cool air over the ocean rises and warmer air from the shore takes its place.

cool air over the shore rises and warmer air from the ocean takes its place.

If a volume of air is warmed, it expands. If a volume of air expands, it warms. neither warms nor cools. cools.

cools.

Heat is measured in _____. a. kilocalories b. joules c. calories d. all of the above e. none of the above

d. all of the above

As the sound of a car's horn passes and recedes from you, the pitch of the horn seems to a. decrease. b. stay the same. c. increase.

decrease.

Noise cancelling headphones use _ to reduce or eliminate sound. a. constructive interference b. destructive interferences correct. c. forced vibrations d. resonance

destructive interference

Noise-canceling earphones are an example of a. constructive interference. b. destructive interference. c. beats. d. resonance.

destructive interference

Suppose you want to save energy, and you're going to leave your warm house for a half hour on a cold day. You should turn the thermostat down 10 degrees or more. down a little. to room temperature. up a little.

down 10 degrees or more

Heat transfer by conduction in metals occurs when atoms give off heat in the form of electromagnetic waves. . electrons bump into atoms and other electrons. electromagnetic waves travel from one place to another through a vacuum. . large numbers of atoms move from place to place.

electrons bump into atoms and other electrons.

(true or false) The complementary color of cyan light is green light.

false

True or False The terms "heat" and "temperature" have the same meaning.

false

True/False Infrared waves are responsible for sunburn.

false

True/False Materials that allow light to pass through them in straight lines are called opaque materials.

false

true or false The color of an opaque object is the color the object absorbs.

false

true or false A substance at a high temperature is said to contain heat.

false

true or false A temperature scale that has 100 degrees between the boiling point and the freezing point of water is the Fahrenheit scale.

false

true or false An example of radiation is a land breeze when the land is cooler than the water

false

true or false An example of radiation is a land breeze when the land is cooler than the water.

false

true or false In conduction, the collisions between particles transfer thermal energy and matter.

false

true/False Electromagnetic heat waves are called ultraviolet waves.

false

Energy transfer by convection is primarily restricted to gases. liquids. solids. fluids none of the above

fluids

In a florist's greenhouse, glass acts as a one-way valve, letting high-frequency light in and preventing low-frequency radiation from escaping. low-frequency light in and preventing high-frequency radiation from escaping. none of the above

high-frequency light in and preventing low-frequency radiation from escaping.

The electromagnetic waves used to keep food warm in the dining hall are a. microwaves b. ultraviolet waves c. gamma rays d. infrared waves

infrared waves

Heat lamps give off mostly ultraviolet waves. radio waves. infrared waves. microwaves. X-rays.

infrared waves.

Plastic foam is a good heat conductor. emitter. absorber. radiator. insulator.

insulator.

The phenomenon of beats results from sound a. interference. b. reflection. c. refraction. d. all of the above e. none of the above

interference.

A cup of hot coffee will cool faster if it has cream in it. is black

is black

Heat transfer by convection occurs when electromagnetic waves travel from one place to another through a vacuum. electrons bump into other electrons. atoms give off heat in the form of electromagnetic waves. large numbers of atoms move from place to place. none of the above

large numbers of atoms move from place to place.

Radiation from the sun often gets trapped in Earth's atmosphere. The reason for this is that long-wavelength radiation is absorbed by the atmosphere. the atmosphere allows only visible and infrared light to enter. radiation from the sun gets reflected from Earth's atmosphere. the atmosphere allows only visible light to enter. radiation from the sun comes in at an angle to Earth.

long-wavelength radiation is absorbed by the atmosphere.

Compared to the wavelength of ultraviolet waves, the wavelength of infrared waves is. the same. longer. shorter.

longer.

A sound wave is a a. standing wave. b. longitudinal wave. c. transverse wave. d. shock wave. e. none of the above

longitudinal wave

Sound is an example of a. transverse wave. b. longitudinal wave. c. standing wave. d. constructive wave. e. Doppler wave.

longitudinal wave.

Sound is an example of a a. standing wave. b. constructive wave. c. transverse wave. d. longitudinal wave.

longitudinal wave.

If a poor absorber of radiation were a good emitter, its temperature could remain lower than that of its surroundings. the same as that of its surroundings. greater than that of its surroundings.

lower than that of its surroundings.

When red and blue light shine on a white sheet, the resulting color is cyan. green. yellow. blue. magenta.

magenta

The three paint colors that are useful for color subtraction are magenta, green, and yellow. red, blue, and yellow. red, green, and blue. magenta, cyan, and red. magenta, cyan, and yellow.

magenta, cyan, and yellow.

The complementary color of green is red. yellow. green. cyan. magenta.

magenta.

During a single period, the distance traveled by a wave is a. two wavelengths. b. one half wavelength. c. one wavelength.

ne wavelength.

Clouds are white because water molecules Clouds are white because water molecules are white. reflect white light. of different sizes form clusters, scattering different colors of light. absorb white light.

of different sizes form clusters, scattering different colors of light.

The time needed for a wave to make one complete cycle is its a. amplitude. b. wavelength. c. period. d. frequency. e. velocity.

period.

The time needed for a wave to make one complete cycle is its a. wavelength.b. period. d. velocity. e. frequency.

period.

Complementary colors are two colors that are next to each other on the color chart. produce white light when added together. look good together. are primary colors.

produce white light when added together.

Heat travels from the sun to Earth by convection. vacuumization. insulation. conduction. radiation.

radiation.

Planet Earth loses heat primarily by conduction. radiation. convection. all of these

radiation.

If you combine magenta ink with yellow ink, what color will you see? a. red b. blue c. green d. black

red

Magenta light is really a mixture of red and yellow light. red and blue light. yellow and green light. red and cyan light.

red and blue light.

The colored dots that make up the color on a TV screen are red, blue, and yellow. yellow, blue, and green. magenta, cyan, and yellow. red, green, and yellow. red, blue, and green.

red, blue, and green

The additive primary colors are _ . a. blue, yellow, and green b. white, red, and cyan c. magenta, cyan, and yellow d. red, green, and blue

red, green, and blue

The three primary colors of light for additive color mixing are red, green, and blue. yellow, cyan, and red. yellow, green, and blue. red, yellow, and blue. red, yellow, and green.

red, green, and blue.

If the atmosphere were 50 times thicker than it now is, the sun would appear orange-green. green-blue. blue-violet. red-orange.

red-orange.

The reason light-colored clothes help keep you cool in warm weather is that clothes of light color weigh less. have a lot of spaces in them. reflect a lot of energy. absorb energy, leaving little to pass through. . all of the above

reflect a lot of energy.

The color of an opaque object is determined by the light that is transmitted. reflected. absorbed. all of the above none of the above

reflected.

A singer shattering crystal glass with her voice is a demonstration of a. beats. b. sound refraction. c. an echo. d. interference. e. resonance.

resonance

The sky is blue because air molecules in the sky act as tiny mirrors that reflect only blue light. prisms. sources of white light. resonators that scatter blue light.

resonators that scatter blue light.

The shadow produced by an object held close to a piece of paper in sunlight will be sharp. fuzzy.

sharp

A child swings back and forth on a playground swing. If the child stands rather than sits, the time for a back and forth swing is a. unchanged. b. shortened. c. lengthened.

shortened.

You dip your finger repeatedly into water and make waves. If you dip your finger more frequently, the wavelength of the waves a. shortens. b. stays the same. c. lengthens.

shortens.

Compared to the speed of light, sound travels a. faster. b. at about the same speed. c. slower.

slower

Compared to its speed in air, the speed of light in water is the same. slower. faster.

slower.

Sounds travel most quickly through

solids, steel

The _ of a material is the quantity of heat required to raise the temperature of a unit mass of the material by 1 degree.

specific heat capacity

If you are looking for an instrument that tells what stars are made of, look for a telescope. stethoscope. stellar microscope. spectroscope.

spectroscope.

Colors seen on a photograph result from color subtraction. addition.

subtraction.

he quantity that tells how hot or cold something is compared with a standard is _.

temperature

Global warming by the greenhouse effect mostly results from the fact that an atmosphere with excess carbon dioxide is less transparent to solar radiation terrestrial radiation. Neither of the above.

terrestrial radiation.

Light shines on a pane of green glass and a pane of clear glass. The temperature will be higher in the green glass. Neither, it will be the same each. the clear glass.

the green glass.

During a solar eclipse a. the sun is between the Earth and the moon b. the moon is between the sun and the Earth c. the Earth is between the sun and the moon

the moon is between the sun and the Earth

the Doppler effect is the change in observed frequency due to a. the original frequency of the source. b. the type of medium the wave is in. c. the motion of the source or observer. d. the type of wave e. all of the above

the motion of the source or observer.

Compared to the velocity of radio waves, the velocity of visible light waves is slower. the same. faster.

the same.

Newton's law of cooling says that the rate of cooling depends on the temperature difference between an object and its surroundings. the volume of an object. the mass of an object. the specific heat capacity of an object. all of the above

the temperature difference between an object and its surroundings.

The primary purpose of polarized sunglasses is to block ultraviolet rays. to block infrared rays. to block glare from reflections.

to block glare from reflections

Materials that transmit light are

transparent

A wave created by shaking a rope up and down is called a a. constructive wave. b. longitudinal wave. c. transverse wave. d. Doppler wave.

transverse wave.

A wave moving perpendicular to the direction its energy moves is called a a. longitudinal wave. b. constructive wave. c. Doppler wave. d. standing wave. e. transverse wave.

transverse wave.

Electromagnetic waves are transverse waves. longitudinal waves.

transverse waves

(true or false) The color of a transparent object is the color it transmits.

true

(true or false) Energy emitted by vibrating electric charges is carried by electromagnetic waves.

true

True/False A thin beam of light is called an X-ray.

true

True/False Light sometimes acts as a wave and sometimes as a particle.

true

True/False The distance light travels in one year is called a light-year.

true

True/False A total shadow is called an umbra.

true

True/False Two colors of light that add together to form black light are called complementary colors.

true

true or false An example of convection is the sea breeze that occurs during the day when the land is warmer than the water

true

true or false Metal is a better conductor than wood.

true

true or false The sky is blue because its component particles scatter high frequency light.

true

The Hertz is a a. unit of period. b. unit of frequency c. special radio wave. d. type of car. e. unit of wavelength.

unit of frequency.

The source of all electromagnetic waves is magnetic fields. heat. electric fields. vibrating charges. none of the above

vibrating charges.

Sound waves are produced by a. radio stations. b. vibrating objects. c. soft objects. d. objects under pressure. e. none of the above

vibrating objects.

The source of all waves is a a. harmonic object. b. vibration.. c. movement of matter. d. region of variable high and low pressure

vibration

The source of all wave motion is a a. physics teacher. b. region of variable high and low pressure. c. vibration. d. movement of matter

vibration.

All sound waves are created by a. medium b. vibrations c. matter

vibrations

Sound travels faster in air if the air is a. neither warm nor cold. b. cold. c. warm.

warm

The main difference between a radio wave and a light wave is its speed. speed. wavelength. both of the above none of the above.

wavelength

The distance between successive identical parts of a wave is called its a. frequency. b. wavelength. c. period. d. amplitude. e. velocity.

wavelength.

The main difference between a radio wave and a light wave is its speed. wavelength. both of the above none of the above.

wavelength.

It is not possible to make _ by combining pigments.

white

Firewalkers who walk barefoot on red-hot wooden coals depend on mind over matter. pure chance wood's poor conductivity.

wood's poor conductivity.

he complementary color for blue light is _ light. a. yellow b. magenta c. green d. red

yellow

The subtractive primary colors are _ . a. red, blue, and green b. yellow, magenta, and cyan c. cyan, green, and blue d. yellow, blue, and white

yellow, magenta, and cyan

A tennis ball is most easily seen if its color is yellow-green violet. white. black.

yellow-green

Humans are most sensitive to light that is red. green-blue. yellow-green. white. black.

yellow-green

Sunlight contains all colors, but much of it is blue. yellow. orange. red. violet.

yellow.

The complementary color of blue is green. yellow. magenta. cyan. violet.

yellow.

When red and green light shine on a white sheet, the resulting color is green. cyan. blue. magenta. yellow.

yellow.