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A certain transition in H spectrum from an excited state to ground state in one or more steps gives rise to total 10 lines. How many of these belong to uv spectrum?

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detailed solution

Correct option is B

Number of spectral lines when electronic transition from higher energy level to ground state n(n-1)2 =10

n2-n =20

n2-n -20 =0

n2 -5n +4n -20=0

(n-5) (n+4) =0

So n=5

For uv spectrum line has to come form higher level to n = 1

 

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