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Radiation coming from transition n = 2 t...

Radiation coming from transition `n = 2 to n = 1` of hydrogen atoms falls on helium in `n = 1 and n= 2` state. What are the possible transition of helium ions as they absorb energy from the radiation?

A

`n = 2 to n = 3`

B

` n = 1 to n = 4 `

C

`n = 2 to n = 5`

D

`n = 2 to n = 4`

Text Solution

Verified by Experts

The correct Answer is:
D
`E = 13.6 xx 1 (1/(1^(2))-1/(2^(2)))=10.2 eV`
For `He^(+)` in n = 2
10.2 eV = `13.6 xx 4 (1/(2^(2))-1/(n^(2))) rArr n = 4 ` .
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