What is the ratio of radii of orbits corresponding to first excited state and ground state in hydrogen atom?

Explanation

Since , `r, alpha,n^2`.
For ground state `n=1`
For `1^st` excited state, `n=2`
`therefore` Required ratio of radii of the orbits
`=((1)^(2))/((2)^(2))=(1)/(4)=1:4`