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Q.

Two waves originating from source S1 and S2 having zero phase difference and common wavelength λ  will show completely destructive interference at a point P if  (S1P−S2P) is

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a

3λ/4

b

11λ/2

c

5λ

d

2λ

answer is D.

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Detailed Solution

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There will be destructive interference at a point if the path difference is odd multiple of λ2

⇒∆x=(2n+1)λ2

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