The intensity of sound from a radio at a distance of $$2$$ metres from its speaker is $$1$$×$$0$$−$$2$$μ W$$/$$$$m2$$. The intensity at a distance of $$10$$ meters would be

Correct option is 34×10−4 μ W/m2

Questions

The intensity of sound from a radio at a distance of 2 metres from its speaker is $1 \times 0^{- 2} μ W / m^{2} .$ The intensity at a distance of 10 meters would be

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0.2×10−2 μ W/m2

1×10−2 μ W/m2

4×10−4 μ W/m2

5×10−2 μ W/m2

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detailed solution

Correct option is C

I∝1r2⇒I2I1=r12r22⇒I21×10−2=22102=4100⇒I2=4×10−2100=4×10−4 μ W/m2

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The intensity of sound from a radio at a distance of 2 metres from its speaker is 1×0−2μ W​/​m2. The intensity at a distance of 10 meters would be

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The intensity of sound from a radio at a distance of 2 metres from its speaker is $1 \times 0^{- 2} μ W / m^{2} .$ The intensity at a distance of 10 meters would be