一道AP物理题How many different photon frequencies can be emitted if an electron is in excited state n=4 in a hydrogen atom?A 1B 3C 5D 6E 8
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题目内容：
一道AP物理题
How many different photon frequencies can be emitted if an electron is in excited state n=4 in a hydrogen atom?
A 1
B 3
C 5
D 6
E 8
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