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EXERCISE 9
(a) If an object has a flux of 0.002 W/m^2 on your telescope, and you know it's 1000 kilometers (1,000,000 m) away, what's its luminosity? (b) If an object has a flux of 0.015 W/m^2 and you know it's a big campfire with a luminosity of 2000 W, how far away is it? |