First slide

Characterstics of wave

Question

Two sources of intensities I and 4 I and waves, which interfere to produce a resultant intensity I_o at a point of phase difference $π / 2 . I_{0}$ is equal to

Moderate

A

5 I
B

4 I
C

3I
D

I

Solution

$R^{2} = a_{1}^{2} + a_{2}^{2} + 2 a_{1} a_{2} \cos θ or I_{0} = I + 4 I + 2 \sqrt{I} \sqrt{4 I} \cos π / 2 or I_{0} = I + 4 I + 0 = 5 I$

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