Page 77 - Science Course 3 (Book 2)

Mo10-L4b: How Do you Hear Sounds?

Compression Rarefaction Compression Rarefaction

HIGH AMPLITUDE SOUND WAVE LOW AMPLITUDE SOUND WAVE

Using Sound Waves

100 High
amplitude
80

60 Medium
amplitude
40
Low
20
amplitude
0
–20
–40

–60
–80
–100

An echo is a ref ected sound wave. Some animals, such as bats and dolphins, use a
method called echolocation to navigate and hunt.
Ref ected Wave

Original Wave

Distance r Returning Sound Wave Sonar Sound Wave

Sonar systems use ref ected sound waves to locate objects under water.

Ref ected Sound Sonar Sound
Wave Wave

69