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A progressive wave moves with a velocity...

A progressive wave moves with a velocity of 36m/s in a medium with a frequency of 200Hz. The phase difference between two particles seperated by a distance of 1cm is

A

`40^(@)`

B

20 rad

C

`(pi)/(9)` rad

D

`(pi^(0))/(9)`

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The correct Answer is:
C
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