CH 11 HW

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To see his full height, Blinky Bill who is 1.0 meter tall needs a mirror that is at least

0.50 m tall

How does the average speed of light in glass compare with its speed in a vacuum?

0.67 c

A diver shines light up to the surface of a smooth pond at a 10° angle to the normal. Some light passes into the air above, and the part that reflects back into the water makes an angle to the normal of

10°

What is the speed of X-rays in a vacuum?

3x10^8 m/s

The inks used in printing the full-color photos in a common magazine are

A mixture of cyan and yellow inks on a printed page appears

Is the whiteness of clouds due mainly to reflection or to scattering?

It is due mainly to reflection from water drops that are much larger than atoms

How does the speed of light that emerges from a pane of glass compare with the speed of light incident on the glass?

It is the same

Does light travel faster in thin air or in dense air? What does this difference in speed have to do with the duration of daylight?

Light travels faster in thin air. This causes sunlight to refract downward as it enters the atmosphere that is denser at the surface. The bending sunlight keeps the image of the sun above the horizon longer, increasing daylight duration

What is the law of reflection?

The angle of reflection equals the angle of incidence

Electromagnetic waves can travel in

a vacuum and water

The black fur of a black-and-white bunny is due to light

absorption

The reason that a surface appears darker when wet has to do with

absorption of multiply-reflecting light inside the wet region

The greenish blue of water is evidence for the

absorption of red light

Colors seen on TV result from color

addition

Glass is transparent to light of frequencies that

are below its natural frequencies

A beam of light emerges from water into air at an angle bent

away from the normal

The main difference between a radio wave and a sound wave is

basic nature

If you wish to spear a small blue fish with a red laser beam, you should compensate for refraction and aim your laser

below the sighted fish

A red crab crawling very deep in the water where sunlight is very dim appears

black

If molecules in the sky scattered red-orange light instead of blue light, sunsets would be

blue

What color light is transmitted by a piece of blue glass?

blue

Which has the higher frequency?

blue light

Which has the highest frequency?

blue light

Refraction occurs when light passing from one medium to another

changes speed

The white light from the Sun is a

composite of light of all the visible frequencies

When you read from a printed page, you're seeing reflected light that is

diffuse

Object and image for a plane mirror lie

equal distances from the mirror

Different colors of light correspond to different light

frequencies

Waves in the electromagnetic spectrum differ by _______

frequency

The inversion of your image in a plane mirror is actually an inversion of

front and back

A mixture of cyan and yellow inks on a printed page appears

green

If sunlight were green instead of white, the most comfortable color to wear on a hot day would be

green

Light shines on a pane of green glass and a pane of clear glass. The temperature will be higher in the

green glass

Because of refraction, the Sun near sunset appears

higher in the sky

Infrared waves are often called heat waves because they

induce resonance of molecules in the skin that becomes thermal energy

Most of the waves in the electromagnetic spectrum are

invisible

According to the law of reflection, the incident ray, reflected ray, and normal between them

lie in the same plane

If a light signal and a radio signal were emitted simultaneously from the Moon, the first signal to reach Earth would be

light and radio

Relative to ultraviolet waves, the wavelength of infrared waves is

longer

A wave with a long wavelength has a relatively

low frequency

A changing electric field induces a changing

magnetic field

Glass is opaque to light with wave frequencies that

match its natural frequencies

Because of refraction a fish in the water appears

nearer the surface

Electromagnetic waves consist of

oscillating electric and magnetic fields

Complementary colors are two colors that

produce white light when combined

Visible light that shines on a pane of transparent glass

produces a chain of absorptions and re-emissions through the glass

Which have the longest wavelength: light waves, X-rays, or radio waves?

radio waves

Which have the longest wavelengths when traveling in a vacuum?

radio waves

Magenta light is a mixture of

red and blue light

The three colors that comprise the image on a TV screen are

red, blue, and green

Distant snow-covered hills appear yellowish due to the color of the

reflected light that survives scattering

The whiteness of clouds is due mainly to

reflection

A mirage is a result of atmospheric

refraction

When ultraviolet light is incident upon glass, most atoms in the glass

resonate

The sky is blue because air molecules in the sky act as tiny

resonators that scatter blue light

Because of refraction, a person standing waist deep in a swimming pool appears to have

shorter legs

Refracted light that bends away from the normal is light that has _______

sped up

Refraction results from changes in light's

speed

Refraction results from differences in light's

speed

The colors dispersed by a prism are due to different light

speeds inside the prism

Colors seen on the cover of our paper-bound physical science text book result from color

subtraction

Consider light energy that is momentarily absorbed in glass and then reemitted. Relative to the absorbed light, the frequency of the reemitted light is

the same

In looking at yourself in a steamy mirror you wipe just enough moisture away to barely see a full view of your face. If you move back from the mirror you'll see

the same amount of your face

Light travels faster in

thin air

Light changes direction when traveling from air into glass due to changes in light's

velocity

Light refracts when traveling from air into glass due to changes in light's

velocity

Both sound and light can travel in

water

When light is refracted, there is a change in its

wavelength

The complementary color of blue is

yellow

The brightest color emitted by the Sun is

yellow-green


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