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Question 31238
JEE Physics · Hard

Sound Waves: Beats MCQ

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

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BeatsHardQuestion 31238

Question

Beats are heard between two tuning forks only when:
  1. A
    Their frequencies are identical
  2. B
    Their frequencies differ by a small amount (usually < 10 Hz for perceptible beats)
    Correct
  3. C
    Their amplitudes are equal
  4. D
    They are struck simultaneously only

Correct answer

Their frequencies differ by a small amount (usually < 10 Hz for perceptible beats)

Explanation

Beats require nearly equal frequencies. If difference is too large (>10–20 Hz for human ear), beat frequency is too fast to perceive as distinct pulses.

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