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A car moving at 30 m/s emits a sound of frequency 500 Hz. What frequency does an

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Question: A car moving at 30 m/s emits a sound of frequency 500 Hz. What frequency does an observer standing still hear as the car approaches?

Options:

  1. 500 Hz
  2. 550 Hz
  3. 600 Hz
  4. 650 Hz

Correct Answer: 600 Hz

Solution: 

Using the Doppler effect formula, f\' = f(v + vo) / (v - vs), where v = 340 m/s, vo = 0, vs = 30 m/s, f\' = 500(340)/(340 - 30) = 500(340/310) ≈ 548 Hz.

A car moving at 30 m/s emits a sound of frequency 500 Hz. What frequency does an

Practice Questions

Q1
A car moving at 30 m/s emits a sound of frequency 500 Hz. What frequency does an observer standing still hear as the car approaches?
  1. 500 Hz
  2. 550 Hz
  3. 600 Hz
  4. 650 Hz

Questions & Step-by-Step Solutions

A car moving at 30 m/s emits a sound of frequency 500 Hz. What frequency does an observer standing still hear as the car approaches?
  • Doppler Effect – The change in frequency or wavelength of a wave in relation to an observer moving relative to the source of the wave.
  • Relative Velocity – Understanding how the speed of the source and observer affects the perceived frequency.
  • Frequency Calculation – Applying the Doppler effect formula to calculate the observed frequency.
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