阿摩線上測驗
8. A star radiates uniformly in all directions. At a distance of 5.0 ✖ 1012 m from the star, the intensity of the radiation from the star is 15 W / m2 . What is the total power output of the star?
(A) 3.2✖1038W
(B) 4.7✖10 27W
(C) 3.8✖1026 W
(D) 7.5✖1013W
(E) 1.1✖1015W
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統計： A(1), B(35), C(6), D(1), E(0) #2020467
統計： A(1), B(35), C(6), D(1), E(0) #2020467
