Electrostatic Force of a hydrogen atom

[MemoIhad]

[SOLVED] Electrostatic Force

Homework Statement

One model of the structure of the hydrogen atom consists of a stationary proton with an electron moving in a circular path around it.The orbital path has a radius of 5.3x10^-11m. The masses of a proton and an electron are 1.67x10^-27kg and 9.1x10^-31kg, respectively. Calculate the electrostatic force between the electron and the proton.

Homework Equations

F=kq1q2/r^2

The Attempt at a Solution

I looked at the question but I really didn't know where to start since none of the qs (charges) where given. I looked at the solution and I found that they used 1.6x10^-19C as the charges, so the equation subbed in looked like this: k(1.6x10^-19C)^2/r^2.
I don't understand where or how they got 1.6x10^-19C. Any help will be appreciated!

 

[hage567]

-1.6x10^-19 C is the charge of one electron and is a constant. The charge on a proton is +1.6x10^-19 C.

 

[MemoIhad]

O, Ok, I understand. I was looking around the book for something like that but couldn't find it. Teacher didn't even bother to mention it.