Q:

The change in pitch (frequency) of a sound when there is relative motion between the sound source and the human observer is known as the:

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The change in pitch (frequency) of a sound when there is relative motion between the sound source and the human observer is known as the:


  1. resonance effect.
  2. interference effect.
  3. diffraction effect.
  4. Doppler effect.

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D: This change of frequency effect is apparent when listening to the sound of a motor vehicle engine as it approaches you and then as it continues past you.

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