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Q.

Electronic transition in He ion takes from n2 to n1 shell such that :
2n2 + 3n1 = 18 ; 2n2 – 3n1 = 6
What will be the total number of photons emitted when electrons transit to n1 shell ?

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a

10

b

21

c

15

d

20

answer is D.

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Detailed Solution

4n2 = 24⇒n2 = 6 ; n1 = 2
no of spectral lines =4(5)2=10

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