阿摩線上測驗
51. The intensity of electromagnetic energy 3 m from the point source is 100 W/m2. What is the intensity 30 m away?
(A) 1000 W/m2
(B) 100 W/m2
(C) 10 W/m2
(D) 1 W/m2
(E) 0.1 W/m2
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統計： A(0), B(0), C(2), D(23), E(0) #3084510
統計： A(0), B(0), C(2), D(23), E(0) #3084510
