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