Physics Color, Reflection, Refraction

Different colors of light travel at different speeds in a transparent medium. In a vacuum, different colors of light travel at

A) The same speed

Humans are most sensitive to light that is

A) Yellow-green

When a sample of an element is heated until it glows, the color it gives off is

B) A continuous band of color

The reason the sky is blue is that air molecules

B) Absorb and then reemit blue light, scattering it in all directions

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

B) Green

An echo occurs when sound

B) Is reflected from a distant surface

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

B) Resonators that scatter blue light.

Earth receives a lot of ultraviolet radiation from the sun. Luckily most of it doesn't reach the ground, because it is

C) Absorbed by a protective layer of ozone gas in the upper atmosphere

A beam of light travels fastest in

C) Air

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

C) Blue

A penny lies in the bottom of a tea cup filled with water. As you look down on the penny, compared to its actual depth, it looks

C) Closer

Which of the following is a consequence of the refraction of light?

C) Rainbows

If the atmosphere were 50 times thicker than it now is, the sun would appear

C) Red-Orange

When a virtual image is created in a plane mirror

C) Reflected rays diverge

The effect that we call a mirage has most to do with

C) Reflection

The reason we can read print from any direction is that

D) All of the above (Letters emit black light in all directions, letters absorb black light from all directions, the white part of a page reflects light in all direction)

Refraction is caused by

D) Bending

A person standing waist-deep in a swimming pool appears to have short legs because of light

D) Refraction

The law of reflection says

D) The angle of reflection from a mirror equals the angle of incidence.

The spectrum produced by a prism or a raindrop is evidence that the average speed of light in the material depends on the light's

D) Transmission qualities

The color of an object we see is determined by the

E) All of the above

The white caps of waves as they overturn are evidence that the water has

A) Broken into an assortment of tiny particles that scatter all colors

Different colors of light correspond to different light

A) Frequencies

When a light beam emerges from water into the air, the average speed

A) Increases

Clouds are white because water molecules

A) Reflect white light

The color of an opaque object is determine by the light that is

A) Reflected

It is difficult to see the roadway from a car on a rainy night because the road surface

A) That is normally a diffuse reflector when dry becomes a mirror surface when wet.

Sunsets are red because

A) The longest path of sunlight through the atmosphere is at sunset or sunrise.

The true color of water is

E) Clear

The cyan color of ocean water is evidence that the water absorbs

E) Red

Sunlight contains all colors of light that is

E) yellow