Question

In Bohr model of hydrogen atom, the ratio of periods of revolution of an electron in n = 2 and n = 1 orbits is

• A. 2 : 1
• B. 4 : 1
• C. 8 : 1
• D. 16 : 1

Answer 1

Answer: (C)

8 : 1

Answer 2

According to Bohr model time period of electron $T \propto n^{3}$

⇒ $\frac{T_{2}}{T_{1}} = \frac{n_{2}^{3}}{n_{1}^{3}} = \frac{2^{3}}{1^{3}} = \frac{8}{1}$

⇒ $T_{2} = 8T_{1}$.