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Question 31374
JEE Physics · Hard

Waves on String: Harmonics MCQ

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HarmonicsHardQuestion 31374

Question

A string sounds simultaneously at 120 Hz, 180 Hz, 240 Hz. Fundamental frequency is:
  1. A
    30 Hz
  2. B
    40 Hz
  3. C
    60 Hz
    Correct
  4. D
    120 Hz

Correct answer

60 Hz

Explanation

Harmonics 120, 180, 240 = 2×60, 3×60, 4×60. GCD = 60 Hz. Fundamental is 60 Hz (2nd, 3rd, and 4th harmonics are heard).

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