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A plane wave zeta= A cos (omega t-kx) pr...

A plane wave `zeta= A cos (omega t-kx)` propagates in the reference frame S. find the equation of this wave in a refreence frame S' moving in the +ve direction of x-axis with a constant velocity V relative to S.

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The correct Answer is:
`zeta'=A cos [omega (1-V/v)t-kx']`
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