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?

Options

A. n = 1 to n = 2 and n = 2 to n = 3
B. n = 1 to n = 3 and n = 2 to n = 4
C. n = 2 to n = 3 and n = 2 to n = 4
D. n = 1 to n = 2 and n = 2 to n = 4

Answer

C

Explanation

`triangle`E for hydrogen atom
`triangle E=13.6(1)^(2)(1-(1)/(4))=10.2eV`
for `He^(+)` ion

`triangle E_(n=2ton=4)=10.2eV`
`triangle E_(n=2 to n=3)=7.56eV`