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Question

When ultrasonic, infrasonic and audible waves travel through a medium with speeds vu, vi and va respectively, then :
  1. vu>va>vi
  2. vu,vi and va are nearly equal
  3. va>vu>vi
  4. vi>va>vu

A
vu>va>vi
B
vu,vi and va are nearly equal
C
va>vu>vi
D
vi>va>vu
Solution
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The speed of a sound wave is used to be affected by the medium property. But it remains almost independent by the change of frequency of the wave. So option a will be right.

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