Question

The radius of a shell for $H-atom$ is $4.761\stackrel{o}{A}$. The value of n is:

• A. 3
• B. 9
• C. 5
• D. None of these

Answer 1

The correct option is A 3

We know, Bhor's radius

$r_n=52.9n^2$ Pm $\to \left(1\right)$

As we are given,

$r_n=4.761\dot{A}$ $\to \left(2\right)$

equating both the equations

$4.761\times {10}^{-10}=52.9n^2\times {10}^{-10}$

$n^2=9$

$n=3$