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A wave represented by the equation y= a...

A wave represented by the equation `y= acos ( kx-omegat)` is superposed with another wave to form a stationary wave such that the point x=0 is a node . The equation for the other wave is

A

`a sin(kx + omega t)`

B

`-a cos(kx - omegat)`

C

`-a cos (kx + omegat)`

D

`-asin(kx - omegat)`

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The correct Answer is:
C
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