# 7th Grade Science : Physical Science

## Example Questions

### Example Question #1 : Physical Science

What point on the image provided represents a wavelength?

C

D

B

A

A

Explanation:

A wavelength is the length of a complete wave cycle, from one crest to the next crest or one trough to the next trough.

Point A is the length from one crest to the next crest; thus, point A represents a wavelength.

### Example Question #2 : Physical Science

What point on the image provided represents a crest?

C

D

A

B

C

Explanation:

The crest of a wave is the upper most point that a wave rises up. Point C is at the upper most point of a wave.

### Example Question #3 : Physical Science

What point on the image provided represents a trough?

D

C

B

A

B

Explanation:

The trough of a wave is the lowest most point that a wave falls downward. Point B is at the lowest most point of a wave.

### Example Question #4 : Physical Science

What point on the image provided represents an amplitude?

D

B

C

A