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Waves question

2016 · Q160
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Waves question

2016 · Q160

NEETPhysicsWavesMCQ+4 / −1
Three sound waves of equal amplitudes have frequencies (n −-− 1), n, (n + 1). They superimpose to give beats. The number of beats produced per second will be
  1. A
    1
  2. B
    4
  3. C
    3
  4. D
    2
View written solutionFree

Correct answer: D

(n – 1) and (n + 1) suppose to form frequency n

n and n will be at resonance

n – 1 and n produce 1 beat

n + 1 and n produce 1 beat

∴\therefore∴ Number of beats formed are ‘2’

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