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Question 31263
JEE Physics · Easy

Sound Waves: Doppler Formula MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Doppler FormulaEasyQuestion 31263

Question

When source and observer move away from each other, observed frequency:
  1. A
    Increases
  2. B
    Decreases
    Correct
  3. C
    Stays same
  4. D
    Doubles

Correct answer

Decreases

Explanation

Recession stretches wavefronts → longer effective wavelength → lower frequency. Red-shift equivalent in sound.

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