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About 5% of the power of a 100 W light b...

About 5% of the power of a 100 W light bulb is converted to visible radiation . What is the average intensity of visible radiation at a distance of 10 m ?
Assume that the radiation is emitted isotropically and neglect reflection .

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`I=(100xx(5//100))/(4pi(10)^(2))=4xx10^(-3)W//m^(2)`
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