13. Assume that a hydrogen atom's electron has been excited to the n = 5 level. How many different wavelengths of light can be emitted as this excited atom loses energy?
(A) 8
(B) 9
(C) 10
(D) 11
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統計: A(0), B(0), C(1), D(0), E(0) #3423516
統計: A(0), B(0), C(1), D(0), E(0) #3423516