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When a transverse plene wave tfanverses ...

When a transverse plene wave tfanverses a medium, judividual particles execute pcriodic motion given by equation `y=4 sin frac(pi)/(2)(2 t+frac(x)/(8))`. The phase difference (in degrec) for two position of same particle which are occupied by time intervals `0.4 s` apart is

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