First slide

Interference

Question

There are 10 sound sources each producing intensity I, at a point independently. They are incoherent. Average intensity of sound at that point will be:

Moderate

A

I
B

10I
C

100I
D

0

Solution

Since the sources are incoherent there will be no sustained interference.
Hence at the given point,
Average intensity = $I_{0} = I_{1} + I_{2} + I_{3} + . . . + I_{10} = 10 I$

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