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Question

During propagation of longitudianl wave, if at any time, there is compresion at a point, after how much time there will be rarefraction ?
  1. T3
  2. T2
  3. T
  4. T4

A
T2
B
T
C
T3
D
T4
Solution
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We know in a longitudinal wave , the distance between two successive compressions and rarefactions is called wavelength , λ , therefore distance between a successive compression and a rarefaction will be λ/2 ,
now by , v=λ/T ,
speed of the wave is constant because medium is same , now to keep speed v constant for λ/2 , time should be T/2 .

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