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Ashika
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Asked: 2024-08-06T11:45:34+05:30 In:

About 5% of the power of a 100 W light bulb is converted to visible radiation. What is the average intensity of visible radiation(a) at a distance of 1m from the bulb?(b) at a distance of 10 m?Assume that the radiation is emitted isotropically and neglects reflection.

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About 5% of the power of a 100 W light bulb is converted to visible radiation. What is the average intensity of visible radiation(a) at a distance of 1m from the bulb?(b) at a distance of 10 m?Assume that the radiation is emitted isotropically and neglects reflection.
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  1. Ashika
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    (a) Average intensity of the visible radiation, I = P’/4πd2

    Here, the power of the visible radiation, P’ = (5/100) x 100 = 5 W

    At d = 1 m

    I = P’/4πd2 = 5/(4 x 3.14 x 12) = 5/12.56 = 0.39 W/m2

    (b) At d = 10 m

    I = P’/4πd2 = 5/(4 x 3.14 x 102) = 5/1256 = 0.39 x 10-2 W/m2

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