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You are using your calculator in a room illuminated by a 120 W bulb 2.8 m...

You are using your calculator in a room illuminated by a 120 W bulb 2.8 m away. Assume the light bulB is designed to send the light uniformly into a hemisphere. The solar cells have an active area of 3 cm^2. If the solar cells are 15% efficient, how much electrical power is the calculator receiving in mW?

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This is based on intensity as explained below...

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