Question

What will be the angular momentum of an electron, if energy of this electron in H-atom is –1.5eV (in J sec) ?

• A. 1.05 × 10^–34
• B. 2.1 × 10^–34
• C. 3.15 × 10^–34
• D. –2.1 × 10^–34

Answer 1

Answer: (C)

3.15 × 10^–34

Answer 2

–1.5eV energy is of n = 3

L = $\frac{nh}{2\pi}$ = $\frac{3h}{2\pi}$ = $\frac{3 \times 6.6 \times 10^{- 34}}{2 \times 3.14}$= 3.15 × 10^–34