Review for Physics Quiz 13.1-13.3

Why can't sound waves travel in a vacuum?

• The pressure is too low in a vacuum.

• The vibrations would not be detected.

• The temperature cannot be raised high enough.

• There are no particles to collide.

What is sound energy converted to by the human ear?

• sound energy

• brain vibrations

• electrical energy

• It is still unknown.

Sound level is a measure of __?__.

• frequency

• amplitude

• wavelength

• pitch

Most sounds are __?__ that comprise more than one frequency.

• vibrating objects

• varying decibels

• amplitudes

• complex waves

__?__ creates the sound spectrum of the fundamental frequency and its harmonics.

• Resonance

• The Doppler effect

• Beats

• Noise

The unit used to measure the frequency of sound is ___.

• decibel

• ultrasound

• rarefaction

• hertz

The unit used to measure the amplitude of sound is ___.

• decibel

• ultrasound

• rarefaction

• hertz

How is frequency related to pitch?

• The higher the frequency of the sound wave, the higher pitched the sound.

• The higher the frequency of the sound wave, the lower pitched the sound.

• The lower the frequency of the sound wave, the higher pitched the sound.

• There is no relationship between frequency and pitch.

The strengthening of a sound wave when it combines with an object's natural vibration is ____.

• decibel

• resonance

• rarefaction

• sonar

Which wave property most affects the intensity or loudness of sound?

• reflection

• complexity

• frequency

• amplitude

• speed