The radius of the second Bohr orbit for hydrogen atom is :
Question:

The radius of the second Bohr orbit for hydrogen atom is :

(Plank’s const. $\mathrm{h}=6.6262 \times 10^{-34} \mathrm{Js}$; mass of electron $=9.1091 \times 10^{-31} \mathrm{~kg}$; charge of electron $\mathrm{e}=$ $1.60210 \times 10^{-19} \mathrm{C}$; permittivity of vaccum

$\left.\epsilon_{0}=8.854185 \times 10^{-12} \mathrm{~kg}^{-1} \mathrm{~m}^{-3} \mathrm{~A}^{2}\right)$

1. 1.65 A

2. 4.76 A

3. 0.529 A

4. 212 A

Correct Option: 4,

Solution: