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Waves question

2006 · Q169
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Waves question

2006 · Q169

NEETPhysicsWavesMCQ+4 / −1
Two sound waves with wavelengths 5.0 m and 5.5. m respectively, each propagate in a gas with velocity 330 m/s. We expect the following number of beats per second.
  1. A
    6
  2. B
    12
  3. C
    0
  4. D
    1
View written solutionFree

Correct answer: A

Frequencies of sound waves are
3305{{330} \over 5}5330​ & 3305.5{{330} \over {5.5}}5.5330​

i.e., 66 Hz and 60 Hz

Frequencies of beat = 66 – 60 = 6 per second

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