Chapter 27 physics
Which type of bell interacts more with high-pitched sounds?
Small bells
The colors of ink used in CMYK printing are cyan, magenta, yellow, and
black
When red, green, and blue light are *absorbed*, the result is
black
Strictly speaking, to say that an apple is red means that
it appears red
What kinds of molecules will scatter the low frequencies of light?
large molecules
Light travels slightly slower in the
lower atmosphere
What color results when red is subtracted from white light?
Cyan
When something is painted red, what color is most absorbed?
Cyan
Why is the sky blue when the Sun is overhead?
The molecules in the atmosphere scatter blue light more than any other light, so the sky looks blue.
What are the colors of the shadows cast by an object that is placed under blue and red lights only?
The red light casts a blue shadow and the blue light casts a red shadow, because the space not illuminated by red is illuminated by blue, and vice versa.
A white boat sunk in water where sunlight is dim appears
cyan
Why does the sky normally appear blue?
Air molecules have resonances in the ultraviolet, so they scatter blue light more than red light
When red, green, and blue light are *combined*, the result is
white
Start with all three light sources on and no object to cast a shadow. If we turn off the blue source, what will the color be in the region that was originally illuminated by all three sources?
yellow
The complementary color of blue is
yellow
A fast-moving ball is more easily seen if it is
yellow-green
Distant dark mountains appear bluish because
you're looking at low-level blue sky between you and the mountain
A mixture of red and green pigments appears
muddy-brown
The atmosphere of Jupiter is more than 1000 km thick. From Jupiter's surface, the Sun at noon would appear
none of the above (none: faintly white, not at all, white)
Fill in the last statement. Green + blue = cyan = white - _____
red
When a red rose is held in white light, the color of its petals appears
red
The whiteness of clouds, unlike the blueness of the sky, primarily involves
reflection and refraction of sunlight
The physics underlying the redness of sunsets and the color of blue jays involves
scattered sunlight
Clouds are white due to
scattering
The sky is blue due mainly to atmospheric
scattering
What kinds of molecules scatter high frequencies of light?
small molecules
Which interacts more with high-frequency light?
small particles
Red sunsets are due to light of lower frequencies that
survive being scattered in the air
How many colors of ink are used to print full-color pictures?
three plus black
Red + blue = magenta = white - green
true
What part of the electromagnetic spectrum is most absorbed by water?
Infrared
What happens to light when it falls upon a material that has a natural frequency above or below the frequency of the light?
It is reemitted
Why does the sky sometimes appear whitish?
Large particles in the atmosphere scatter longer wavelength light that adds to the blue light to create white light
If you look with a magnifying glass at pictures printed in full color in this or other books or magazines, you'll notice three colors of ink plus black. What are these colors?
Magenta, cyan, and yellow
Why is the sunset red?
Only the low-frequency red light penetrates the thick layers of atmosphere when the Sun is low in the sky.
The color of seawater is a result of the subtraction of what color?
Red
What part of the *visible* electromagnetic spectrum is most absorbed by water?
Red
Which of these colors of light represents the lowest visible frequency?
Red.
What frequency ranges of the radiation curve do red, green, and blue light occupy?
Red: low; green: middle; blue: high frequencies
What happens when light from the Sun interacts with the molecules of the atmosphere?
The molecules scatter the light.
With all three lights are on, we insert an object that casts a shadow. What will be the colors of the shadows, and why?
The three shadows will be cyan, yellow, and magenta, because these are the complements of the three primary colors.
What accounts for the whiteness of a cloud?
Water droplets of different sizes scatter a variety of light frequencies, resulting in a white cloud
When white light is incident upon green glass the color that emerges is
green
Light shines on a pane of green glass and a pane of clear glass. The temperature will be higher in the
green glass
A sunset appears red in color due to
higher frequencies of light scattered away
Red + green + blue = white
true
Red + green = yellow = white - blue
true
The dimmest part of sunlight is
violet