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Q.

Two point sources X and Y emit waves of same frequency and speed but Y lags in phase behind X by 2pl radian. If there is a maximum in direction D the distance XO using n as an integer is given by

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a

λ2(n−l)

b

λ(n+l)

c

λ2(n+l)

d

λ(n−l)

answer is B.

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Detailed Solution

For maxima  2π n=2πλ(XO)−2π lor  2πλ(XO)=2π(n+l)   or  (XO)=λ(n+l)
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