Physics Chapter 28 Review
As a fire engine moves toward you, the frequency of the waves produced by the sire reaching your ear
increases
Which of the following is not an electromagnetic wave? infrasonic ultraviolet microwave gamma ray
infrasonic
When two or more waves are at the same place at the same time, the resulting effect is called
interference
If you are standing equally distant from two television sets that are emitting the exact same sound waves, the sound
is louder because the waves constructively interfere
Choose one: If an object is truly black, it absorbs only black light it reflects all light it reflects only black light it cannot be seen
it cannot be seen
The speed of light changes with
it never changes
Magenta, yellow, and cyan are the ___ colors used in printing illustrations in full color.
subtractive primary
What color would Asher's red shirt appear to have if illuminated with sunlight? with red light? with blue light?
sunlight: red red light: red blue: ?
The blue shift seen when astronomers view distant galaxies is an example of
the Doppler effect
When you turn up the volume on your television what happens to the sound wave?
the amplitude of the wave increases
The color of an object is determined by: the color of light it absorbs the color of light it reflects the color of light it emits
the color of light it reflects
Which best describes the light that results when a color is subtracted from white light? black magenta muddy brown the complementary color to the subtracted color
the complementary color to the subtracted color
Humans are most sensitive to light that is
yellow-green
Explain what happens when paints or dyes are mixed.
The mixture absorbs all the frequencies each paint absorbs.
Describe what happens when the frequency of the light shining on an object resonates with the object's natural frequency.
The object absorbs the light.
Describe what happens when the frequency of the light shining on an object is higher or lower than the object's natural frequency.
The object reemits the light.
Which below best describes what occurs when many particles larger than oxygen and nitrogen molecules are in the atmosphere? The sky appears darker blue. The sky appears black. The sky appears whitish. The sky appears green.
The sky appears whitish.
Describe how the color of the sky changes as more and more high frequency light is scattered.
The sky becomes progressively redder, going from yellow to orange.
Describe the relationship between the size of a particle in the atmosphere and the frequency of the light it scatters.
The tinier the particle, the higher the frequency of light it will scatter.
If you double the frequency of a vibrating object, its period
halves
T/F: At sunset, only lower-frequency light strikes the Earth.
true
T/F: Atoms and molecules can behave like optical tuning forks, reemitting light waves that shine on them.
true
T/F: By mixing red, blue, and green light and adjusting the brightness of each, virtually any color can be formed.
true
T/F: Different sources of light produce light made up of different frequencies.
true
T/F: Sunlight is the combination of all colors.
true
T/F: Water is transparent to nearly all the frequency of white light.
true
T/F: When made to emit light, each element has its own unique color.
true
Frequencies above 20 kHz are
ultrasonic
Sound waves are produced by
vibrating objects
The source of all wave motion is a
vibration
All waves are created by
vibrations
The distance between the crests of two successive waves is called the
wavelength
What determines the amount of atoms in a glass a light wave will interact with?
wavelength of the light wave
A white object appears ___ when illuminated by white light.
white
Which of the following is not a color? green white red blue
white
what color of light is produced when red, blue and green light of equal brightness overlap?
white light
Which color of light that is scattered as it passed through the atmosphere? red orange yellow blue
red
The colored dots that make up the color on a TV screen are
red, blue and green
If the period of a wave is 4 seconds/wave, then the frequency of the wave is
1/4 wave/second
The three primary colors of light for additive color mixing are
red, green, and blue
What determines the color of a transparent object?
A transparent object is the color of the light it transmits.
Which below best describes the color of an opaque object: An opaque object is the color it absorbs. An opaque object is the color of the light that shine on it. An opaque object is the color it reflects. An opaque object is the color of white light.
An opaque object is the color it reflects.
What does each line in a line spectrum represent?
Each line corresponds to a distinct frequency of light emitted by the atom.
Solar eclipses are seen less commonly than lunar eclipses because
Earth's shadow on the moon is larger than the moon's shadow on Earth
Describe the process used to print a color image in a book.
Four different inks, magenta, yellow, cyan and black, are used. Each color is printed on its own color plate. Each plate produces a series of ink dots on the page, the result of which gives the appearance of a wide range of colors.
How is the frequency of a photon related to the energy change in an atom?
Frequency is directly proportional to the energy change.
Explain how a color television produces a wide range of colors on its screen.
Grouping of spots of red, blue and green cover the screen. By varying how much each colored spot is illuminated within each grouping, different colors are formed.
Which statements below are true about Newton's study of color? He studied sunlight. He passed sunlight through triangular-shaped pieces of glass. He observed that sunlight was broken into rainbow-like pattern of colors. He showed that sunlight is yellow light.
He studied sunlight. He passed sunlight through triangular-shaped pieces of glass. He observed that sunlight was broken into rainbow-like pattern of colors.
___ was the first person to do a systematic study of color.
Isaac Newton
What color is produced if you mix red, blue and green paint? Give details in your explanation.
Need answer (also did not put calculation questions on the study guide)
Although violet light is scattered more than blue light, our eyes see the sky as blue. Explain.
Our eyes are more sensitive to blue light than to violet light so we see the sky as blue.
What is pitch?
Our subjective impression of sound
An astronomer is trying to determine if a distant galaxy is moving toward our galaxy, the Milky Way, or away from our galaxy. How will the Doppler Effect help determine the answer?
Ricett answer -1 (How?): The Doppler Effect will tell him what frequencies the distant galaxy is so he can calculate the speed and direction at which it is moving.
A sales person offers to sell you a pair of x-ray glasses and tells you they will allow you to see your own bones. Is seeing your own bones by using a pair of glasses possible? Why or why not?
Ricetti answer received full credit: Using glasses to see your bones is not possible because x-rays are electromagnetic waves and are eyes are not that sensitive to see x-rays.
Which below best explains what the energy from the light absorbed by a piece of glass does to the glass? The energy hardens the glass. The energy warms the glass. The energy darkens the glass. The energy has no effect on the glass.
The energy warms the glass.
Describe what happens when sunlight passes through blue glass.
The glass transmits primarily the blue light and absorbs the other colors that illuminate it.
What is the relationship between pitch and loudness?
There is no relationship between pitch and loudness.
Explain why many clouds appear white.
They contain water droplets with a wide range of sizes. These droplets scatter a wide range of frequencies to produce a white-looking cloud.
Which below best explains why cells containing chlorophyll are green. They absorb green light. They produce food. They reflect green light. They are very small.
They reflect green light.
Explain this statement: White and black are not actually colors.
White is not a color, but is a combination of all colors. Black is not a color; it is the absence of all light.
Which visible frequencies make up the brightest part of sunlight? a. Red-Blue b. Yellow-Red c. Blue-Green d. Yellow-Green
Yellow Green
Compared to red light, blue light has
a higher frequency
A longitudinal wave lacks which of the following properties? wavelength frequency speed amplitude a longitudinal wave has all of the above
a longitudinal was have all of the above
To create yellow light you combine a. red and green light. b. red and blue light. c. green and blue light.
a. red and green light.
Complementary colors are colors that a. two colors that combine to produce white. b. any group of colors that combine to produce white. c. look good together.
a. two colors that combine to produce white.
Earth receives a lot of ultraviolet radiation from the sun. Luckily most of it doesn't reach the ground, because it is
absorbed by a protective layer of ozone gas in the upper atmosphere
Colors seen on TV result from color
addition
The colors you see on a television are an example of color by
addition
Red, blue and green light are known as the ___ colors.
additive primary
Sunsets are red because: shorter wavelength light reaches the ground blue light is scattered so much it is not seen the individual light rays from the sun must travel further through Earth's atmosphere all of the above
all of the above
The color of an object we see is determined by the: colors of light reflected by the object colors of light shining on the object frequencies of light absorbed by the object frequencies of light reflected by the object all of the above
all of the above
What is a spectroscope?
an instrument used to analyze the light emitted by glowing elements
Where can you touch a standing wave on a rope without disturbing the wave?
at a node
The color of a transparent object is determined by: a. the color of the light it reflects. b. the color of the light it transmits. c. the color of the light it absorbs.
b. the color of the light it transmits.
When blue light is shined on a yellow cloth, the cloth will appear
black
As the path of sunlight through the atmosphere increased, what color of light is scattered more?
blue
Complementary color to yellow
blue
What color(s) are absorbed by yellow paint?
blue and violet
The complementary color of green is a. yellow. b. blue. c. magenta. d. cyan.
c. magenta.
Electromagnetic waves
can travel through a vacuum
Two colors of light that when added together produce white are known as ___.
complimentary colors
The trough of one wave overlapping the trough of another wave creates
constructive interference
Water molecules absorb certain frequencies of colored light. What is the complementary color to the color that is absorbed? magenta yellow cyan white
cyan
The subtractive primary colors are a. red, blue, and green. b. cyan, magenta, and red. c. magenta, yellow, and green. d. magenta, yellow, and cyan.
d. magenta, yellow, and cyan.
A cloud containing many large water droplets appear ___.
dark
Loudness is measure in units called
decibels
As the sound of a car's horn passes and recedes from your, the pitch of the horn seems to
decrease
Noise canceling earphones are an example of
destructive interference
The crest of one wave overlapping the trough of another wave creates
destructive interference
Waves transmit
energy
An energy level greater than an atom's lowest energy state is known as an ___.
excited state
T/F: At sunset, light reaches Earth's surface through a shorter path than at noon.
false
T/F: Black objects that you can see absorb all light that falls on them.
false
T/F: Human vision is the most sensitive to colors in the red-orange part of the visible spectrum.
false
T/F: The amount of scattering that occurs at sunset varies very little from day to day.
false
T/F: The brightness of sunlight is directly proportional to frequency.
false
T/F: The deep-blue color of a pond or an ocean is due to the color of the water itself.
false
T/F: The mixing of colored paints yields similar results as mixing the same colors of light.
false
T/F: The presence of water droplets in the atmosphere does not affect how much light is scattered or what frequencies of light are scattered.
false
T/F: The sky appears blue because particles in the atmosphere scatter low-frequency light.
false
T/F: The spectrum emitted by an excited atom is continuous.
false
T/F: When an object reemits the light that shines on it, absorption occurs.
false
If the sun were to disappear right now, we wouldn't know about it for 8 minutes because it takes 8 minutes: for the sun to disappear to operate receiving equipment in the dark for light to travel from the sun to the Earth all of the above none of the above
for the light to travel from the sun to the Earth
Complementary color to magenta...
green
If white light shines on a mixture of blue and yellow paint, what color is not absorbed?
green
If you mix cyan paint with yellow paint the color you get is
green paint
Sound is an example of a
longitudinal wave
If the sounding board were left out of a music box, the music box would
make little "plinks" that you could hardly hear
The unit of measure for velocity is
meters/second
cyan
mixture of green and blue
magenta
mixture of red and blue
yellow
mixture of red and green
Different materials have different ___ for absorbing and emitting radiation.
natural frequencies
You drop a glass in the kitchen and it breaks. Mom and Dad heard the noise and know you broke the glass even though they were not in the kitchen because of:
natural frequency
The mixing of pigments, paints or dyes is known as color mixing by ___.
subtraction
If you double the frequency of a wave, its period is
one-half of what it was before
Sound cannot travel through
outer space
After reaching an excited state, an atom emits a ___ and then returns to its normal state.
photon
A ___ is a material in glass that selectively absorbs colored light.
pigment
The graphical distribution of brightness versus frequency in sunlight is called the ___.
radiation curve
The low pressure area of a sound wave is called
rarefaction
Complementary color to cyan
red
What color does water molecules absorb? red green blue all
red
What color(s) are absorbed by blue paint?
red, orange and yellow
List the colors of the visible spectrum in correct color order.
red, orange, yellow, green, blue, violet
The only objects we can see are those objects that
reflect or emit light
A red rose is red because: it reflects blue and green light it absorbs red light while reflecting blue and green light absorbs red light reflects red light
reflects red light
Which below is the process in which sound or light is absorbed and reemitted in all directions? reflection resonance scattering stimulated emission
scattering
Compared to the speed of light, sound travels
slower
Compared to the velocity of radio waves, the velocity of visible light waves is faster the same slower
slower
Which of the following is NOT a transverse wave? light sound radio wave all of the above none of the above
sound
Which of the following is NOT an electromagnetic wave? sound infrared radio X-ray Light
sound
A spread of color is called a ___.
spectrum
Which of the following would be most likely to transmit sound with the highest speed? Wood in a cabinet water in the ocean air in your classroom water in a swimming pool steel in a bridge
steel in a bridge
What determines the colors emitted by an atom?
the energy levels of its electrons
The period of a pendulum depends only on
the length of the pendulum and the acceleration of gravity
What is the brightest portion of the spectrum of sunlight?
the middle of the visible range or the yellow-green region
In a solar eclipse
the moon is between the Earth and the sun
The color of a transparent object is the color it
transmits
Electromagnetic waves are
transverse waves
