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Q.

How many lines are formed in the visible region of spectrum when excited electrons in hydrogen spectrum de excites from 5th orbit to the ground state in all possible transitions?

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a

1

b

10

c

3

d

4

answer is C.

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Detailed Solution

 Σ(n2−n1)⇒Σ(5−1)=Σ4 ⇒4+3+2+1=10

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