Calculate the radius ratio of `3^(rd) & 5^(th)` orbit of `He^(+)`.
`r=0.529xx(n^(2))/(Z) Å`
At. Number of of He `=2`

Explanation

`therefore " "r^(3) = 0.529xx((3)^(2))/(2)=0.529xx(9)/(2)`
`r^(5) = 0.529xx((5)^(2))/(2)=0.529xx(25)/(2)`
Therefore `(r_(3))/(r_(s))=(0.529xx (3)^(2)/(2))/(0.529xx(5)^(2)/(2))`
`(r_(3))/(r_(s))=(9)/(25)`