# Homework Help: What is the angular momentum of an electron

1. Jun 30, 2008

### pooka

What is the angular momentum of an electron in a level with n = 13 in the Bohr hydrogen atom (Planck's constant: h = 6.63 10-34 J s)?

I used the equation L= mr2ω
L=nh/2pi

I solved for r:
r = n2a where a=5.29•10-11 m

plugging all these values in, i can't seem to get the right answer for angular momentum. Also what are the units for angular momentum?

2. Jul 1, 2008

### Dick

Gack! Angular momentum is r x p. r is meters, p is kg*m/sec. But an electron can be in level n=13 with zero angular momentum if it's in an s state. I don't get the question.

Last edited: Jul 1, 2008
3. Jul 1, 2008

### malawi_glenn

He said bohr model, and in that model you don't have s,p,d waves etc.

but instead, L is quantized as: L = n*hbar

So that is basically what you need dude