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Question 31231
JEE Physics · Hard

Sound Waves: Beats MCQ

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BeatsHardQuestion 31231

Question

If a tuning fork of frequency 480 Hz gives 5 beats with a wire. When wire tension increases slightly, beat frequency decreases to 3. Wire frequency was:
  1. A
    475 Hz
    Correct
  2. B
    485 Hz
  3. C
    478 Hz
  4. D
    483 Hz

Correct answer

475 Hz

Explanation

Increasing tension raises wire frequency. If beats decreased from 5 to 3, wire moved closer to fork — wire was below fork. Wire frequency = 480 − 5 = 475 Hz.

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