Ration of time revolution of electron in second excited state of `He^(+)` and second state of `H` is `(3^(x))/(2^(y))`.
`(x + y)` is

Options

A. `9`
B. `7`
C. `8`
D. none of these

Answer

C

Explanation

`T prop ((mn^(3))/(Z^(2)))` (one and two number species are respectively)
`(._(2)He^(+)` and `._(1)H)`
`(T_(1))/(T_(2)) = (n_(1)^(2))/(n_(2)^(3))(Z_(2)^(2))/(Z_(1)^(2))` or `= (T_(1))/(T_(2)) = (3^(3))/(2^(5))`