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Question

In the following figure the energy levels of hydrogen atom have been shown along with some transitions as marked A,B,C,D and E. The transitions A,B and C respectively represent :



A
The first member of Lyman series, third member of Balmer series and second member of Paschen series.
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B
The ionisation potential of hydrogen, second member of Balmer series and third member of Paschen series.
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C
The series limit of Lyman series, second member of Balmar series and second member of Paschen series.
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D
The series limit of Lyman series, third member of Balmer series and second member of Paschen series.
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Solution

The correct option is D The series limit of Lyman series, third member of Balmer series and second member of Paschen series.
Transition A is corresponding to infinity to n=1 which is the last line (series limit) of Lyman series, transition B is from n=5 to n=2 which is third line of Balmer series and transition C is from n=5 to n=3 which is second line of Paschen series.

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