Questions

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?

a

3

b

4

c

5

d

6

detailed solution

Correct option is B

Number of spectral lines when electronic transition from higher energy level to ground state $\frac{\mathrm{n}(\mathrm{n}-1)}{2}$ =10

n^{2}-n =20

n^{2}-n -20 =0

n^{2} -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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