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If a source of sound is moving towards a stationary observer, what happens to th

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Question: If a source of sound is moving towards a stationary observer, what happens to the frequency of the sound heard by the observer?

Options:

  1. It decreases
  2. It remains the same
  3. It increases
  4. It becomes zero

Correct Answer: It increases

Solution: 

According to the Doppler effect, if the source is moving towards the observer, the frequency increases.

If a source of sound is moving towards a stationary observer, what happens to th

Practice Questions

Q1
If a source of sound is moving towards a stationary observer, what happens to the frequency of the sound heard by the observer?
  1. It decreases
  2. It remains the same
  3. It increases
  4. It becomes zero

Questions & Step-by-Step Solutions

If a source of sound is moving towards a stationary observer, what happens to the frequency of the sound heard by the observer?
  • Step 1: Understand that sound travels in waves.
  • Step 2: Know that frequency is how many waves pass a point in a certain time.
  • Step 3: When a sound source moves towards you, it compresses the sound waves in front of it.
  • Step 4: This compression means more waves reach you in the same amount of time.
  • Step 5: Because more waves reach you, the frequency of the sound you hear increases.
  • Step 6: This effect is called the Doppler effect.
  • Doppler Effect – The change in frequency or wavelength of a wave in relation to an observer moving relative to the source of the wave.
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