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What is the principle behind the Doppler effect?

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Question: What is the principle behind the Doppler effect?

Options:

  1. Change in frequency due to relative motion
  2. Change in amplitude due to distance
  3. Change in speed due to medium
  4. Change in wavelength due to temperature

Correct Answer: Change in frequency due to relative motion

Solution: 

The Doppler effect is the change in frequency (and wavelength) of a wave in relation to an observer moving relative to the wave source.

What is the principle behind the Doppler effect?

Practice Questions

Q1
What is the principle behind the Doppler effect?
  1. Change in frequency due to relative motion
  2. Change in amplitude due to distance
  3. Change in speed due to medium
  4. Change in wavelength due to temperature

Questions & Step-by-Step Solutions

What is the principle behind the Doppler effect?
Correct Answer: The Doppler effect is the change in frequency (and wavelength) of a wave in relation to an observer moving relative to the wave source.
  • Step 1: Understand that waves can be sound waves or light waves.
  • Step 2: Know that the Doppler effect happens when the source of the wave is moving.
  • Step 3: Realize that if the source moves towards an observer, the waves get compressed, making the frequency higher.
  • Step 4: If the source moves away from the observer, the waves get stretched, making the frequency lower.
  • Step 5: Remember that this change in frequency also affects the wavelength of the waves.
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