Question

The energy of an electron in excited Hydrogen atom is – 3.4 eV. Then, according to Bohr's Theory, the angular momentum of this electron in Js is –

• A. 2.11 × 10^–34
• B. 3 × 10^–34
• C. 2 × 10^–34
• D. 0.5 × 10^–34

Answer 1

Answer: (A)

2.11 × 10^–34

Answer 2

The electron is in 2^nd orbit

so, L = $\frac{nh}{2\pi}$

or L = $\frac{2 \times h}{2\pi}$ = $\frac{6.6 \times 10^{–34}}{3.14}$ = 2.11 × 10^–34 Js