Unit 6 Earth Physics (6B3)

Things that vibrate make sounds. To vibrate means to move _______ very quickly.

• backwards and forwards

• slowly

• in a strange pattern

Leroy was playing the bongo to a small crowd of people. After a few minutes more of them gathered to watch him. Leroy then had to hit the bongo harder to increase the ________ of sound.

• pitch

• volume or loudness

• medium

The highness or lowness of the tone of a sound is called pitch. A baby crying makes a ______.

• low pitch

• high pitch

• perfect pitch

Sound travels from a vibrating object to our ears. This is called a "sound _____".

It is the substance that a wave passes through.

• particles

• pitch

• medium

The picture shows the "speed of sound" in different mediums. In which medium does sound travel best?

• solid

• liquid

• gas

Why can't sound travel in a vacuum?

• because the particles are too close to each other

• because there are no particles in it

• because the speed of sound in vaccum is over 9000!!!

The reflection of a sound wave is called a/an ______.

• echo

• reflection

• rebound

What kind of surface reflects sound best?

• small, rough, soft

• large, smooth, flat, hard

• large, rough, dry, soft,

A/an _______ is a characteristic feature of something.

• property

• echo

• effect