`He^(+)` ions are excited to respective first excited states. Subsequently, H-atoms transfer their total excitation Energy to Het jons collisions). Assume that the Bohr model of atom is exactly valid.
The ratio of the kinetic energy of the n= 2 electron for the H atom to that of `He^(+)` ion is

Options

A. `1/4`
B. `1/2`
C. 1
D. 2

Answer

A

Explanation

`KE alpha Z^(2)//n^(2)`
`(KE_(H))/(KE_(He))=((Z_(H))/(2) "/" (Z_(He))/(2))^(2)=1/4`