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The intensity I of light from a light bulb varies inversely as the square of the distance

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The intensity I of light from a light bulb varies inversely as the square of the distance d from the bulb. Suppose that I is 90 W/m2 (watts per square meter) when the distance is 5 m. How much farther would it be to a point where the intensity is 40 W/m2?
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I k d 2 90 k 5 2 Substituting 90 k 25 2250 k The equati...View the full answer


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