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Equations of two progressive waves at a certain point in a medium are given by, ` y_1 =a_1 sin ( omega t+phi _1) and y_ 1 =a_2 sin (omegat+ phi _2) ` If amplitude and time period of resultant wave formed by the superposition of these two waves is same as that of both the waves,then `phi _ 1-phi _2 ` is

A

` (pi)/(3) `

B

` (2pi)/( 3) `

C

` (pi)/(6) `

D

` (pi)/(4)`

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The correct Answer is:
B
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