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Doppler Effect in Light Waves

Two wave of i...

Question

Two wave of intensity $I$ undergo interference. The maximum intensity is obtained, is

A

I / 2

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B

2 I

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C

I

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D

4 I

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Solution

The correct option is D $4 I$
Intensity of two wave when obtaonted = $I_{r} = I_{1}^{2} + I_{2}^{2} + I_{1} I_{2} c o s θ$
$I_{r} i s m a x i m u m w h e n θ = 0$
also $I_{1} = I_{2} = I$
so $I_{r} = 4 I$

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