Wednesday, August 17, 2011
A low energy, 13-watt bulb illuminates your desk from a distance of 1.2m. You can ume that it acts as a....
A low energy, 13-watt bulb illuminates your desk from a distance of 1.2m. You can ume that it acts as a point source and that it is 100% efficient. What is the intensity (power per unit area) at the desk (in Wmˉ²)?
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