61.在窄束條件下,光子在物質中經過一個鬆弛長度(relaxation length)後,其強度約降為其初始值之多少?
(A)0.57
(B)0.37
(C)0.27
(D)0.17
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統計: A(101), B(1520), C(103), D(58), E(0) #1384364
統計: A(101), B(1520), C(103), D(58), E(0) #1384364