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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=I1+I2+2I1I2 cosϕ=4I

Physics

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