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Q.

Maximum number of different spectral lines which will be obtained in visible region when in a sample of large number of H-atoms containing atoms in 2nd, 3rd and 5th excited state only is given by :

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a

15

b

3

c

4

d

depends on relative number of atoms in 2nd 3rd and 5th excited state.

answer is B.

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Detailed Solution

The number of spectral lines we have,

n=3, n=4, n=6

Visible region ⇒6→2;5→2;4→2;3→2

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Maximum number of different spectral lines which will be obtained in visible region when in a sample of large number of H-atoms containing atoms in 2nd, 3rd and 5th excited state only is given by :