Question

The value of `(n_(2)+n_(1))` and `(n_(2)^(2)-n_(1)^(2))` for `He^(+)` ion in atomic spectrum are 4 and 8 reaspectively . The wave length of emitted photon whwn electron jump from `n_(2)` to `n_(1)` is
A. `(32)/(9)R_(H)`
B. `(9)/(32)R_(H)`
C. `(9)/(32R_(H))`
D. `(32)/(9R_(H))`

Answer 1

Correct Answer - C
`n_(2)+n_(1)=4`
`n_(2)^(2)-n_(1)^(2)=8`
`n_(2)=3," " n_(1)=1`
`lambda=R.4[(1)/(1^(1))-(1)/(3^(2)]]=(32R)/(9)rArr lambda=(9)/(32R)`