Science help! thanks!!!

Question

1: Of the following, the only object that would be visible in a perfectly dark room would be

a mirror.

any light-colored surface

a red hot wire.

2: The shadow of a cloud on the ground is the same size and shape as the cloud itself because the sun's rays are

practically parallel

highly diverging

not very numerous.

3: What is polarized light?

Light from a Polaroid camera

Light filtered in one direction

Light that consists of all colors

4: What makes laser light coherent?

It gives off only one color

Electrons stimulated to give light all at once

The ruby rod has a mirror on one end

5: Why do CD players use laser light?

It is cheaper than high intensity bulbs

It can be focused to a small point on the CD

Laser light responds to music better

Answer 1

1. (c)

Because the other two objects would need to reflect the ambient light in the room, which is nothing. The wire would have an internal source of light, which is heat.  

2. (a)

3. (b)

4. (a), all light has same frequency

5. (b)