Question

Radius of the 1^st orbit of hydrogen atom is r₀. What will be the radius of the 4^th orbit?

Answer 1

`r  α  n^2`

`=> r_1/r_4 = 1^2/4^2`

`=> r_0/r_4 = 1/16`

⇒ r₄ = 16 r₀

The radius of the 4^th orbit of a hydrogen atom is 16 times the radius of the 1^st orbit.