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Q.

Two coherent point sources of frequency (f=10vd where v is speed of light in air) are placed at a distance d apart as shown in figure. The receiver is free to move along the dotted line shown in the figure. The total number of maxima observed by receiver is

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a

2

b

4

c

6

d

8

answer is C.

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Detailed Solution

λ=d10, path difference =nλ=nd/10  Maximum path difference =2d3-d3=d3. Therefore nd10≤d3 ∴ |n=±1,±2,±3| ∴|n|=6
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