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A sound source is moving away from an observer. If the source emits a sound of f

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Question: A sound source is moving away from an observer. If the source emits a sound of frequency 400 Hz, what frequency does the observer hear?

Options:

  1. Less than 400 Hz
  2. Exactly 400 Hz
  3. More than 400 Hz
  4. Infinity

Correct Answer: Less than 400 Hz

Solution: 

As the source moves away, the frequency decreases, so the observer hears a frequency less than 400 Hz.

A sound source is moving away from an observer. If the source emits a sound of f

Practice Questions

Q1
A sound source is moving away from an observer. If the source emits a sound of frequency 400 Hz, what frequency does the observer hear?
  1. Less than 400 Hz
  2. Exactly 400 Hz
  3. More than 400 Hz
  4. Infinity

Questions & Step-by-Step Solutions

A sound source is moving away from an observer. If the source emits a sound of frequency 400 Hz, what frequency does the observer hear?
  • Step 1: Understand that the sound source is moving away from the observer.
  • Step 2: Know that when a sound source moves away, the frequency of the sound heard by the observer decreases.
  • Step 3: The original frequency of the sound emitted by the source is 400 Hz.
  • Step 4: Since the source is moving away, the frequency the observer hears will be less than 400 Hz.
  • Doppler Effect – The change in frequency or wavelength of a wave in relation to an observer moving relative to the wave source.
  • Frequency Shift – When a sound source moves away from an observer, the frequency of the sound heard by the observer is lower than the emitted frequency.
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