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Q.

The intensity of sound from a point source is 1.0×10−8 W/m2 at a distance of 5.0 m from the source. What will be the intensity at a distance of 25 m from the source? (in ×10−10 W/m2)

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Detailed Solution

Here I1=1.0×10−8 W/m2     r1=5.0m, I2=?, r2=25 mWe know that I∝1r2I1r12=I2r22I2=I1r12r22=1.0×10−8×25625=4.0×10−10 W/m2
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