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The Luminosity of Alpha Centauri A. Alpha Centauri A lies at a distance of 4.4 light-years and has an apparent brightness in our night sky of 2.7 ×10^-8 watt/m ^2. Recall that 1 light-year =9.5 ×10^15 m a. Use the inverse square law for light to calculate the luminosity of Alpha Centauri A. b. Suppose you have a light bulb that emits 100 watts of visible light. (Note: This is not the case for a standard 100 -watt light bulb, in which most of the 100 watts goes to heat and only about 10^-15 watt
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