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Calcualte the radiation energy of a star

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A certain star is 15.5 million light-years away from Earth. The intensity of the light that reaches Earth from that star is 6.4e-21 W/m2 (compare this to 1350 W/m2 for the Sun!). At what rate does this distant star radiate electromagnetic energy? Hint: a light-year is the distance that light travels in one year.

-The answer is not 1.73X10^23W

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Calcualte the radiation energy of a star by knowing the intensity and distance.

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