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A certain oscillation results from the a...

A certain oscillation results from the addition of coherent oscillations of the same direction `y= a cos [omegat+(k-1)phi]` where k is the number of oscillation [ k=1,2………N] and `phi` is the phase difference between `k^("th") and (K-1)^("th")` oscillations. The amplitude of resultant oscillation will be

A

`(a sin (N//2))/(sin (phi//2))`

B

`a sin (phi//2)`

C

`a sin (nphi)/2`

D

`alpha`

Text Solution

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The correct Answer is:
A
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