SB1 Echoes

All waves can be reflected if they hit a surface.

• True

• False

A sound wave reflected is called a bounce-back

• True

• False

Echoes are what we hear when sound waves hit a surface and reflect off it.

• True

• False

Echoes are more likely to happen from sound hitting a soft surface.

• True

• False

Soft surfaces can absorb sound waves better than hard surfaces.

• True

• False

Sound waves are caused by objects vibrating.

• True

• False

Echoes are used to measure distances.

• True

• False

Using echoes to measure things under water is called radar.

• True

• False

Ultrasound and sonar use high frequency sound waves.

• True

• False

A high frequency sound wave will have a low pitch (make a low note not a high one).

• True

• False