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The intensity of a light source is measured to be 150 W/m2 . You know that...

The intensity of a light source is measured to be 150 W/m2 . You know that the power consumption of that light source is 5000 W and that 5% of the used power is converted into light. How far away is light source from you? (Assume no light is scattered or absorbed by air or anything else on the way to your detector.)

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