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If a source of solid is moving, a stationary listener will hear a sound of...

Physics
JAMB 2020

If a source of solid is moving, a stationary listener will hear a sound of different frequency. This is called?

  • A. doppler effect
  • B. resonance
  • C. ultra sound
  • D. rarefaction
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Correct Answer: Option A
Explanation

The Doppler effect or Doppler shift is the change in frequency of a wave in relation to an observer who is moving relative to the wave source.

The drop in pitch of ambulance sirens as they pass by and the shift in red light are common examples of the Doppler Effect. 

There is an explanation video available below.


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Explanation Video

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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WAEC and NECO CBT App for Mobile Devices - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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