Stationary `He^(o+)` ion emits a photon corresponding to the first line of the lyman series. The photon then emitted strikes a H atom in the ground state. Find the velocity of the photoelectron ejected out of the hydrogen atom. The value of `R` is `1.097 xx 10^(7)m^(-1)`

Answer

`3.09xx10^(8)cm//sec`

Explanation

`E=-2.18xx10^(-18)(Ƶ)/(n^(2))g//"atom"`
`DeltaE=(E_(2)-E_(1))=(1)/(2)mv^(2)`
`V=1.89xx10^(6)m//sec`
`v=1.89xx10^(8)cm//sec`