Question: Express the answer in scientific notation. A particular star is 2 . 5 1 0 1 7 m away from Earth with a luminosity (

Express the answer in scientific notation.
A particular star is 2.51017 maway from Earth with a luminosity (L) of 1.81028 W. Ignoring the effects of the atmosphere, what is the brightness (B) of the star, in W/m2, as observed from Earth?
B =108 Wm2

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