(Savvas 17.4) Ch. 17.4 Sound and Hearing

Is the following sentence true or false? Ultrasound is sound at frequencies that are lower than most people are capable of hearing.

• True

• False

Is the following sentence true or false? The Doppler effect is a change in sound frequency caused by motion of the sound source, motion of the listener, or both.

• True

• False

Tags

NGSS.HS-PS4-1

For a stationary observer, as a moving sound source approaches, the observer will first hear a(n) _______ frequency of sound and then a(n) _______ frequency as the source moves away.

• higher, lower

• lower, higher

• Oops. The frequency of the sound will not change.

Tags

NGSS.HS-PS4-1

Is the following sentence true or false? Many musical instruments vary pitch by changing the frequency of standing waves.

• True

• False

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-5

A "dead spot" in a theater refers to a location with reduced volume, which is caused by the ________ of sound waves.

• destructive interference

• constructive interference

• diffraction

• absorption

The sympathetic response of a standing wave to another wave of the same frequency is called _______.

• resonance.

• interference.

• diffraction.

• reflection.

Tags

NGSS.HS-PS4-1

Which statement correctly describes how a sound wave travels through air?

• The wave carries molecules of air away from the source of the sound.
  
• The wave carries energy that causes molecules to move back and forth.
  
• The wave moves through the air and gains energy from the moving molecules that it touches.
  

Tags

NGSS.MS-PS4-2

What happens when you increase the amplitude of a sound?

• It makes the sound louder.

• It makes the sound travel faster.

• It increases the wavelength of the sound.

• It increases the pitch of the sound.

Tags

NGSS.MS-PS4-1

What does the loudness of sound depend on? (Mark all correct answers.)

• Frequency of the sound wave

• Amplitude of the sound wave

• Distance from the source of sound

• Velocity of the sound wave

Tags

NGSS.MS-PS4-1

High pitched sounds have a relatively large

• frequency
• wavelength
• amplitude
• period
• speed

Tags

NGSS.HS-PS4-1