MCQ
The radius of the second Bohr orbit for hydrogen atom is .......... $\mathop A\limits^o $
(Plank's const. $ h = 6. \times 10^{-34}\, Js\,;$ mass of electron $= 9.1091 \times 10^{-31}\, kg\,;$ charge of electron $e= 1.60210 \times 10^{-19}\, C\,;$ permittivity of vaccum $\in _0 = 8.854185 \times 10^{-12} \,kg^{-1} \,m^{-3} A^2$)
- A$1.65$
- B$4.76$
- C$0.529$
- ✓$2.12$
