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Question 31262
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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 31262

Question

Doppler effect formula: source moving toward stationary observer:
  1. A
    f₀(v−v_s)/v
  2. B
    f₀v/(v−v_s)
    Correct
  3. C
    f₀(v+v_s)/v
  4. D
    f₀v/(v+v_s)

Correct answer

f₀v/(v−v_s)

Explanation

Source approaching: wavefronts pile up in front → smaller effective wavelength → higher observed frequency. f = f₀v/(v−v_s).

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