Sound waves

Sound is made when a source of energy forces the matter around it to __________.

• Vibrate

• Amplitude

• Stay still

• Pitch

A back-and-forth motion causing particles to move close together generates a ________.

• Rarefaction

• Surface wave

• Compression

A rarefaction is generated when particles move

• Together

• Under

• Apart

Sound waves CANNOT travel through which of these:

• Paper

• Milk

• Outer space

Why can't sound waves travel through a vacuum?

• There are no particles to travel through and vibrate.

• It is not dense enough.

• The frequency is too high.

• Sound waves can travel through a vacuum.

What happens when a wave reflects?

• It bends as it enters a new medium.

• It splits into smaller waves.

• It bounces off the surface of a barrier.

• It bends to move around a barrier.

Energy is transferred in the direction of the movement of the wave

• True

• False

Bigger or ______ waves carry more energy.

Vibrations of particles transport energy from place to place without transporting ______. ( number of spaces are not according to the answer)

• water

• matter

• air

• waves

Our ears pick up __________________ as sound.

• loudness

• noise

• Particle vibration

• particles