First slide

Bohr Model of the Hydrogen atom.

Question

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

Moderate

A

2.1 × 10^–34
B

3 × 10^–34
C

2 × 10^–34
D

0.5 × 10^–34

Solution

If E = –3.4ev then n = 2
$L = \frac{nh}{2 π} = \frac{2 x 6.6 x 10^{- 34}}{2 (3.14)}; L = 2.1 x 10^{- 34}$

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