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Equations of a stationery and a travelling waves are `y_(1)=a sin kx cos omegat and y_(2)=a sin (omegat-kx)` The phase differences between two between `x_(1)=(pi)/(3k)` and `x_(2)=(3pi)/(2k) are phi_(1) and phi_(2)` respectvely for the two waves. The ratio `(phi_(1))/(phi_(2))`is

A

1

B

`(5)/(6)`

C

`(3)/(4)`

D

`(6)/(7)`

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The correct Answer is:
D
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