2223 Sound

Which one is a soft sound?

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Things ... when they make a sound.

• Roll

• Spin

• twist

• vibrate

A girl flicks a ruler. The ruler ... and makes a sound

• move

• vibrate

When she flicks the ruler harder, it makes bigger vibration. So the sound is...

• Louder

• Softer

Small vibrations make .... sound

• louder

• softer

John hears the sound of the siren. As the police car moves away, the sound of the siren gets

• Louder

• Softer

The worker use a drill. The worker wears earmuffs to protect his ... from the loud sound.

• Ears

• Eyes