Q.

The number of possible lines of Paschen series when electron jumps from seventh excited state up to ground state (in hydrogen like atom) is

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a

2

b

5

c

4

d

3

answer is B.

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Detailed Solution

For 7th excited state , n=8Number of lines of Paschen series=5 8→ 3,  7→3, 6→3,  5→3,  4→3.
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The number of possible lines of Paschen series when electron jumps from seventh excited state up to ground state (in hydrogen like atom) is