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Q.

The total number of spectral lines observed when electron returns from the 6^th shell until the 2^nd shell in hydrogen atom is

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a

2

b

8

c

10

d

15

answer is B.

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Detailed Solution

No. of spectral lines = $\frac{n (n - 1)}{2}$ (Where n= 6) = $\frac{6 (6 - 1)}{2} = \frac{6 (5)}{2} = 15$

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The total number of spectral lines observed when electron returns from the 6th shell until the 2nd shell in hydrogen atom is