本题目来源于试卷: Nuclear & Quantum Physics E.1 Atomic Structure，类别为 IB物理学
[单选题]
An electron in a hydrkvza2+pti3e4 ego7 o(ogen atom is ofh+00ydpnq )coep;g8px fao / (1v8 qexcited from the ground state of $n=1$ to the $n=4$ level. What is the total number of frequencies that can be observed from the emission spectrum as the electron returns to ground state?
A. 12
B. 6
C. 4
D. 3
参考答案: B
本题详细解析:
Explanation: Count all possible de-excitations below n=4. From n=4 electron can de-excite to n=3,2,1; 3 possible frequencies. From n=3 electron can de-excite to n=2,1; 2 possible frequencies. From n=2 electron can de-excite to n=1; 1 possible frequency. Total of 6 frequencies.
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