# Chapter 27

*its frequency*
Color depends on what characteristic of light?
its amplitude
its frequency
both of these
*absorbed.*
When the frequency of light matches the natural frequency of molecules in a material, light is
transmitted.
absorbed.
reflected.
none of these
*reflected.*
The color of an opaque object is the same as the light that is
transmitted.
reflected.
absorbed.
all of these
none of these
*blue*
What color light is transmitted by a piece of blue glass?
red
white
orange
blue
yellow
*yellow-green.*
The brightest color emitted by the sun is
violet.
yellow-green.
red.
green-blue.
orange.
*c) a plot of brightness of sunlight versus its frequency.*
a) a dent in the otherwise spherical sun
b) the path taken by the sun as it travels around the Earth
c) a plot of brightness of sunlight versus its frequency
d) a plot of the colors of sunlight versus their frequencies
e) a plot of light intensity versus distance from the sun
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*B) green glass. *
Light shines on a pane of green glass and a pane of clear glass. The temperature will be higher in the

A) clear glass.
B) green glass.
C) Neither – it will be the same in each.

*B) red, blue, green. *
The colored dots that make up the color on a TV screen are
A) magenta, cyan, yellow.
B) red, blue, green.
C) yellow, blue, green.
D) red, green, yellow.
E) red, blue, yellow.
If three primary colors of light are to shine on a white wall to produce a white spot, the primaries must be
b) subtractive
c) multiplicative
d) divisive
*C) yellow.*
The complementary color of blue is

A) red.
B) green.
C) yellow.
D) cyan.
E) magenta.

*D) produce white light when added together. *
Complementary colors are two colors that

A) look good together.
C) are subtractive primary colors.
D) produce white light when added together.
E) are right for each other.

Colors seen on TV results from color
subtraction.
either of these
neither of these
*B) subtraction. *
Colors seen on the cover of our physics book result from color

B) subtraction.
C) either of these
D) neither of these

*A) red and blue light.*
Magenta light is really a mixture of

A) red and blue light.
B) red and cyan light.
C) red and yellow light.
D) yellow and green light.
E) none of these

*d) frequencies*
Different colors of light correspond to different light
a) velocities
b) intensities
c) polarities
d) frequencies
e) none of these
*b) green*
A mixture of cyan and yellow pigments appears
a) orange
b) green
c) magenta
d) blue
e) blackish brown
*D) magenta, cyan, yellow, and black.*
Look at a full-color picture in a magazine with a magnifying glass and you’ll see that the inks used are

A) red, green, and blue.
B) red, green, blue, and black.
C) magenta, cyan, and yellow.
D) magenta, cyan, yellow, and black.
E) none of these

* resonators which scatter blue light. *
The sky is blue because air molecules in the sky act as tiny

A) mirrors which reflect only blue light.
B) resonators which scatter blue light.
C) sources of white light.
D) prisms.
E) none of these

*B) small particles *
Which interacts more with light of relatively high frequencies?

A) large particles
B) small particles
C) both the same

*C) a mixture of particle sizes.*
A whitish sky is evidence that the atmosphere contains

A) predominantly small particles.
B) predominantly large particles.
C) a mixture of particle sizes.
D) water vapor.
E) pollutants.

*D) survive being scattered in the air. *
Red sunsets are due to lower frequencies of light that

A) are scattered from larger particles in the air.
B) are refracted from larger particles in the air.
C) are reflected by clouds and relatively large particles in the air.
D) survive being scattered in the air.
E) appear reddish orange to the eye.

*C) just after a rainstorm. *
The sky is the deepest blue

A) just before a rainstorm.
B) during a rainstorm.
C) just after a rainstorm.
D) when the air is humid.
E) just before sunset.

*A) water droplet sizes.*
The whiteness of clouds is evidence in the clouds for a variety of

A) water droplet sizes.
B) molecules.
C) “seeds” upon which condensation of cloud material forms.
D) light intensities.
E) water prisms.

*E) no color – black.*
A red crab very deep in water, where sunlight is dim, appears

A) red.
B) orange.
C) cyan.
D) brown.
E) no color – black.

*cyan light.*
A sheet of red paper will look black when illuminated with

A) red light.
B) yellow light.
C) magenta light.
D) cyan light.
E) none of these

*A) magenta. *
If sunlight were green instead of white, the most comfortable color to wear on a cold day would be

A) magenta.
B) yellow.
C) green.
D) blue.
E) violet.

*A) refraction of sunsets and sunrises all around the world. *
The redness of the lunar eclipse is evidence for the

A) refraction of sunsets and sunrises all around the world.
B) infrared light continually emitted by the moon.
C) scattering of lower frequencies of light by the moon.
D) faintly radiating atoms in our own atmosphere when sunlight is not incident upon them.
E) dim light that is incident upon the moon by Jupiter and other planets.

*A) red-orange.*
If the atmosphere were about 40 times thicker, at noon the sun would appear

A) red-orange.
B) orange-green.
C) green-blue.
D) blue-violet.
E) none of these

*A) atmosphere between the observer and the hills. *
Distant dark colored hills appear blue because that is the color of the

A) atmosphere between the observer and the hills.
B) selectively reflected light that reaches a distant observer.
C) reflected light that survives scattering.
D) sky that is reflected off the hills.

Paint Pigments
are tiny particles that absorb specific colors
*Complementary Colors *
Red + Blue = Magenta
Red + Green = Yellow
Blue + Green = Cyan
*subtractive color mixing*
How does colored paint mix?
*Absorption*
Most things we see do not produce light themselves. Instead they reflect or transmit part of the light that shines on them. The rest of the light is absorbed.
*complementary color*
for any given color on the color wheel, the color exactly opposite it is called it’s complementary color
*secondary light colors*
what you get when you combine two primary colors.
yellow, magenta, and cyan
*White paint *
White paint No pigment produces
Black paint
mix all three colors: cyan, yellow, and magenta or CYM. and you get
*White light*
White light all three primary colors gives you
*black*
the absence of light
*subtractive color mixing *
involves pigments like those in paint or ink. The primary colors for Paint are cyan, yellow, and magenta or CYM.