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Doppler Effect in Light Waves

How many spec...

Question

How many spectral lines are obtained in the spectra of $L i^{2 +}$ ?

A

10

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B

15

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C

20

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D

17

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Solution

The correct option is C $15$
Given, both absorb $10.2 e V$ .
Consider ${L i}^{2 +}$ , Its energy levels are $- 122.4 e V, - 30.6 e V, - 13.6 e V, - 7.65 e V, - 4.896 e V, - 3.4 e V, - 2.49 e V, 1.91 e V . . . . . . . . .$
Possible transition is from $n = 3$ to $n = 6$
When de excited, ${L i}^{2 +}$ gives $\frac{6 \times 5}{2} = 15 l i n e s$

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