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The intensiti...

Question

The intensities of two light sources are I and 9I respectively. If the phase difference between the waves emitted by them is $π$ , then the resultant intensity at the point of observation will be

A

3I

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B

4I

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C

10I

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D

82I

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Solution

The correct option is B 4I
$I = I_{1} + I_{2} + 2 \sqrt{I_{1} I_{2}} c o s ϕ = 4 I$

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