Waves and Sound

The medium sound waves travel through is *

• a vacuum.

• air.

• rocks.

• energy.

Sound waves are *

• transverse waves.

• circular waves.

• longitudinal waves.

• polarized waves.

In general, sound travels faster through *

• solids than through gases

• gases than through solids

• gases than through liquids

• empty space than matter

The frequency of a sound wave determines *

• the pitch of the sound.

• how fast the sound travels.

• how loud the sound is.

• the magnitude of the compression.

Which of these affects the loudness of a sound?

• frequency of the waves

• pitch of the sound

• amplitude of the waves

• speed of the sound

Which of these affects the pitch of a sound?

• frequency of the waves

• pitch of the sound

• amplitude of the waves

• speed of the sound

The Doppler effect occurs with

• all waves

• only sound waves

• only water waves

• only transverse waves

Waves that appear to be stretched out indicate what about the motion of the wave source?

• it is moving away from the observer

• it is moving towards the observer

• it is stationary

• it is right by the observer

The perceived loudness of a sound is measured in *

• watts per square meter

• hertz

• decibels

• watts

Which of the following decibel levels is nearest to the value that you would expect for a running vacuum cleaner?

• 10 dB

• 30 dB

• 70 dB

• 120 dB