Whenever a hydrogen atom emits a photon in the Balmer series
A
It need not emit any more photon
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B
It may emit another photon in the Paschen series
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C
It must emit another photon in the Lyman series
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D
It may emit another photon on the Balmer series
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Solution
The correct option is B It must emit another photon in the Lyman series Balmer series, electron is still in excited state. (n=2), so it will definitely come to a lower energy state by transit from (n=2ton=1)