Sound Waves & Intensity
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Questions and Answers

Which of the following best describes the Doppler effect?

  • The Doppler effect is the change in intensity of a sound wave when the source of the sound is moving towards or away from the observer.
  • The Doppler effect is the change in frequency of a sound wave when the source of the sound is moving towards or away from the observer. (correct)
  • The Doppler effect is the change in speed of a sound wave when the source of the sound is moving towards or away from the observer.
  • The Doppler effect is the change in pitch of a sound wave when the source of the sound is moving towards or away from the observer.

What happens to the pitch of a sound wave when the source of the sound is moving away from the observer?

  • The pitch of the sound wave becomes distorted.
  • The pitch of the sound wave increases.
  • The pitch of the sound wave remains the same.
  • The pitch of the sound wave decreases. (correct)

Does the Doppler effect only occur with sound waves?

  • No, the Doppler effect does not occur with any type of wave.
  • Yes, the Doppler effect only occurs with sound waves.
  • No, the Doppler effect can occur with any type of wave.
  • No, the Doppler effect can also occur with light waves. (correct)

What can the Doppler effect be used to measure?

<p>The distance of stars. (A)</p> Signup and view all the answers

What causes differences in pressure in a sound wave?

<p>The amplitude of the sound wave. (D)</p> Signup and view all the answers

How does the intensity of a sound wave change with distance?

<p>The intensity of a sound wave decreases with distance. (D)</p> Signup and view all the answers

What unit is used to measure the intensity of a sound wave?

<p>Decibels. (C)</p> Signup and view all the answers

What is the purpose of this text?

<p>To explain how sound waves work. (A)</p> Signup and view all the answers

What is the relationship between the speed of an ambulance and the sound waves it produces?

<p>The speed of the ambulance has no effect on the sound waves it produces. (A)</p> Signup and view all the answers

What happens to the peaks of the sound waves when an ambulance is driving away from the observer?

<p>The peaks of the sound waves become farther apart. (A)</p> Signup and view all the answers

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