阿摩線上測驗
49. Electromagnetic wave is travelling in the free space with the amplitudes of the electric and magnetic fields as Emax and Bmax, respectively. What is the average energy density in the space?
(A)
(B) 
(C) 
(D)
(E)
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統計： A(0), B(0), C(0), D(2), E(8) #2993348
統計： A(0), B(0), C(0), D(2), E(8) #2993348
