1.

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 numberof 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

Answer»

`(a SIN (N//2))/(sin (phi//2))`
`a sin (phi//2)`
`a sin (NPHI)/2`
`ALPHA`

ANSWER :A


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