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JEE Physics · Medium

Sound Waves: Doppler Application MCQ

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Doppler ApplicationMediumQuestion 31264

Question

A train moving at 72 km/h (v_sound = 340 m/s) sounds a horn at 500 Hz. Frequency heard by stationary observer in front is:
  1. A
    471 Hz
  2. B
    533 Hz
    Correct
  3. C
    500 Hz
  4. D
    550 Hz

Correct answer

533 Hz

Explanation

v_s = 72 km/h = 20 m/s. Observer in front: f = 500 × 340/(340−20) = 500×340/320 = 531.25 ≈ 533 Hz.

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