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JEE Physics · Medium

Sound Waves: Beats MCQ

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BeatsMediumQuestion 31225

Question

Tuning fork A (512 Hz) and B give 4 beats/second. B is loaded with wax and now gives 3 beats/second. Frequency of B before loading was:
  1. A
    508 Hz
  2. B
    516 Hz
    Correct
  3. C
    515 Hz
  4. D
    509 Hz

Correct answer

516 Hz

Explanation

Loading with wax decreases B's frequency. Beats decrease from 4 to 3, so B was higher than A initially (516 Hz − 512 = 4). After loading: 516−Δ and beats = |512−(516−Δ)| decreases. B was 516 Hz.

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