When ultrasonic, infrasonic and audible waves travel through a medium with speeds vu, vi and va respectively, then :
vu>va>vi
vu,vi and va are nearly equal
va>vu>vi
vi>va>vu
A
vu>va>vi
B
vu,vi and va are nearly equal
C
va>vu>vi
D
vi>va>vu
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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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