What is Sound?

Sound is a form of

• music.

• energy.

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Sound is made when matter

• plays.

• vibrates.

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To vibrate is to move quickly

• back and forth.

• up and down.

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The loudness or softness of a sound is the sound's

• volume.

• pitch.

Objects that vibrate slowly have a pitch that is

• high.

• low.

A triangle has a high pitch because it vibrates

• quickly.

• slowly.

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Loud sounds over along period can do your ears

• harm.

• good.

A siren has a

• high pitch.

• low pitch.

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A whisper has a

• high volume.

• low volume.

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Why is it important that a sounding siren be very loud but not last very long each time it is used?

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