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Question

What is the Doppler effect?

  1. The bending of light around obstacles
  2. The change in frequency of a wave in relation to an observer who is moving relative to the wave source
  3. The splitting of white light into its constituent colors
  4. The interference of two light waves

Answer:

Option B: The change in frequency of a wave in relation to an observer who is moving relative to the wave source

Detailed Solution:

The correct answer is “The change in frequency of a wave in relation to an observer who is moving relative to the wave source”.

The Doppler effect is the change in frequency of a wave (sound or light) for an observer moving relative to the source of the wave. It explains why a siren sounds higher pitched as it approaches and lower pitched as it recedes.