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Given a light bulb that produces an intensity of approximately 1 Watt/m^2 at a distance of 2m from the bulb,?

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what is the intensity 4m away from the bulb?

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  1. IF the light is radiating in all directions, with no lens or reflector, then intensity is inversely proportional to square of distance.

    You double the distance, the intensity goes down by 4, or to 1/4 watt/m²

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