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Q.

Two coherent sources of different intensities send waves that interface. The ratio of maximum to minimum intensity is 25:1. The intensity ratio of the sources is

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a

625 : 1

b

25 : 1

c

5 : 1

d

9 : 4

answer is C.

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Detailed Solution

The ratio of maximum and minimum intensities is 

ImaxImin=I1+I2I1-I22=251

⇒I1I2=32

⇒I1I2=94

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