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Q.

Consider ten identical sources of sound all giving the same frequency but having phase angles which are random. If the average intensity of each source is I0. The average resultant intensity I due to all these ten sources will be ______

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a

I=100 I0

b

I=10 I0

c

I= I0

d

I= 10 I0

answer is B.

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Detailed Solution

There will be no interference as the sources have random phases. only general illumination occurs.∴ I = I1+I2+....+I10 = Io+Io+...+Io= 10Io

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