Wave and Acoustics | Physics JEE previous year questions with Solutions

(13) For incoherent wave $I_{1} = I_{A} + I_{B} \Rightarrow I_{1} = I_{0} + 9 I_{0}$

$I_{1} = 10 I_{0}$

For coherent wave $I_{2} = I_{A} + I_{B} + 2 \sqrt{I_{A} I_{B}} \cos 60^{0}$

$I_{2} = I_{0} + 9 I_{0} + 2 \sqrt{9 I_{0}^{2}} \cdot \frac{1}{2} = 13 I_{0}$

$\frac{I_{1}}{I_{2}} = \frac{10}{13}$

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