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A supernova releases 1.3×1045 J of energy (over a period of about 10 days). It is...

A supernova releases 1.3×1045 J of energy (over a period of about 10 days). It is 1520 ly (light-years) from earth. A detector, facing the star, is a disk of radius 7 cm. How much energy reaches the detector? (The detector is in orbit, so it can face the star for the entire 10-day period.)

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