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Q.

An electron in 6th orbit of hydrogen atom de excites to ground state in all possible ways. Number  of Emission spectral lines observed will be

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a

10

b

15

c

20

d

6

answer is B.

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Detailed Solution

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Number of spectral lines=nn+12...where n=n2-n1;

Ground state = 1st orbit;   

n = 6-1= 5 ; 

Number of spectral lines=5×62=15 ;

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