Sound and Waves Quiz

What is the pitch of a sound a response to?

• Amplitude of sound

• Frequency of sound

• Intensity of sound

• Decibels of sound

Answer explanation

The pitch of a sound is a response to the frequency of the sound. Pitch is determined by the frequency of the sound wave, with higher frequencies corresponding to higher pitches.

What does the loudness of a sound depend on?

• Frequency of the wave

• Wavelength of the wave

• Amplitude of the wave

• Speed of the wave

Answer explanation

The loudness of a sound depends on the amplitude of the wave. The greater the amplitude, the louder the sound.

In what unit is the loudness of sound measured?

• Hertz (Hz)

• Joules (J)

• Decibels (dB)

• Watts (W)

Answer explanation

The loudness of sound is measured in Decibels (dB), which is a unit used to quantify the intensity of sound waves.

What does the measure of intensity relate to in terms of sound?

• Frequency of the pressure wave

• Energy of the pressure wave

• Speed of the pressure wave

• Wavelength of the pressure wave

Answer explanation

The measure of intensity in sound relates to the energy of the pressure wave, not the frequency, speed, or wavelength.

What is the unit for sound intensity?

• Watts per metre squared

• Decibels

• Hertz

• Joules

Answer explanation

The unit for sound intensity is Watts per metre squared, which measures the power of sound over a given area.

What is the more common term for sound intensity?

• Decibels

• Watts per metre squared

• Hertz

• Joules

Answer explanation

The more common term for sound intensity is Decibels, which is a unit used to measure the intensity of sound waves.

In which direction does the air motion move in relation to the propagation of the sound wave?

• Perpendicular to the direction of propagation

• Back and forth in the direction of propagation

• Circular around the direction of propagation

• Diagonally to the direction of propagation

Answer explanation

The air motion moves back and forth in the direction of propagation of the sound wave.

What characteristic is associated with longitudinal waves in the context of sound waves?

• Air motion is perpendicular to the direction of propagation

• Air motion is circular around the direction of propagation

• Air motion is back and forth in the direction of propagation

• Air motion is random in all directions

Answer explanation

Longitudinal waves in sound waves are characterized by air motion that is back and forth in the direction of propagation.

What do the peaks in a sound wave represent?

• Times when air molecules are far apart, causing lower pressure.

• Times when air molecules are clustered, causing higher pressure.

• Times when air density is lower than nominal.

• Times when the eardrum vibrates.

Answer explanation

The peaks in a sound wave represent times when air molecules are clustered, causing higher pressure.

What do the valleys in a sound wave represent?

• Times when air molecules are clustered, causing higher pressure.

• Times when air density is higher than nominal.

• Times when air density (and hence the pressure) is lower than nominal.

• Times when the eardrum vibrates.

Answer explanation

The valleys in a sound wave represent times when air density (and hence the pressure) is lower than nominal.