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## Homework Statement

What is the velocity of an electron in the hydrogen atom if the centripetal force is supplied by the Coulomb's force between the electron and proton?

## Homework Equations

The radius of the electron orbit is 5.29 X 10^-11

## The Attempt at a Solution

The answer in the back of the book is 2.19 X 10^6 m/s. I am not really sure how to start this problem since it only gives me the radius. Please help!