Lesson 4, 5 & 6 Cumulative Sound Review

Front

What is the Doppler effect?

Back

The Doppler effect is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source.

Front

What happens to sound waves when a wave-making source moves toward an observer?

Back

The frequency of the sound waves increases, making the sound higher in pitch.

Front

What is a rarefaction in a sound wave?

Back

A rarefaction is the area in a sound wave where the molecules are spread out and there is lower pressure.

Front

What is a compression in a sound wave?

Back

A compression is the area in a sound wave where the molecules are close together and there is higher pressure.

Front

Why can't sound travel in a vacuum?

Back

Sound requires a medium (solid, liquid, or gas) to travel through; in a vacuum, there are no molecules to transmit the sound.

Front

What medium can sound travel through?

Back

Sound can travel through solids, liquids, and gases.

Front

What is the speed of sound in air?

Back

The speed of sound in air at room temperature is approximately 343 meters per second.

Front

How does temperature affect the speed of sound?

Back

The speed of sound increases with an increase in temperature.

Front

What is wavelength in relation to sound waves?

Back

Wavelength is the distance between two consecutive points of the same phase in a wave, such as from crest to crest.

Front

What is frequency in relation to sound waves?

Back

Frequency is the number of waves that pass a point in one second, measured in Hertz (Hz).