Revolutions in a Bohr Model

[Jacob87411]

According to the Bohr theory, how many revolutions will an electron make in the first excited state of hydrogen if the lifetime in that state is 10^-8?

Basically do I find the speed of the that the electron moves in this excited state then get the distance that a revolution is and divide it by the time?

[dextercioby]

Find the period for the first orbit and then use 10^{-8}s and the following reasoning

1 revolution---------------------------->T [s]

x revolutions---------------------------->10^{-8}s

Daniel.

[Jacob87411]

Right. When finding the period do I take velocity to be the speed of light?

[dextercioby]

No,the velocity on the first orbit

v_{I}=\alpha c

,where \alpha is the fine structure constant...

Daniel.