Circular Motion with a hydrogen atom

1. Nov 16, 2009

all_relative

1. The problem statement, all variables and given/known data
In the Bohr model of the hydrogen atom, the speed of the electron is approximately 2.01e6 m/s.
Find the central force acting on the electron as it revolves in a circular orbit of radius 4.84e-11 m.

2. Relevant equations

Fc=m*v^2/R

3. The attempt at a solution
I said that the mass was 1.674e-27 kg. If i should use another number, please let me know.

Fc=m*v^2/R
Fc=(1.674e-27)*(2.01e6)^2/(4.84e-11)
Fc=1.39e-4

When I submit this answer to UTexas (an online HW service) it says that I am wrong. I have done this problem several times and keep getting the same thing.

Thanks!

2. Nov 16, 2009

hage567

You are not using the right value for the mass.

3. Nov 16, 2009

all_relative

What is the correct value for the mass?
I looked it up on Google and that is what I found.

Thanks.

4. Nov 16, 2009

hage567

You are looking for the mass of an electron. Is that what you googled?