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If a sound source moves towards an observer, what happens to the frequency heard

Practice Questions

Q1
If a sound source moves towards an observer, what happens to the frequency heard by the observer?
  1. Increases
  2. Decreases
  3. Remains the same
  4. Becomes zero

Questions & Step-by-Step Solutions

If a sound source moves towards an observer, what happens to the frequency 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 one second.
  • Step 3: When a sound source moves towards you, it compresses the sound waves in front of it.
  • Step 4: This compression causes more waves to reach you in a shorter amount of time.
  • Step 5: Because more waves reach you quickly, the frequency 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 wave source.
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