Question

How many times does the electron go round the first orbit in a second?

Answer 1

The frequency of electron is given by

$f=\frac{v}{2\pi r}$

$v=$ velocity with which the electron are moving

$r=$ radius of the hydrogen atom

$v=2-2\times {10}^6$ m/s

Radius of orbit$=0.5287\times {10}^{-10}$m

$f=\frac{2.2\times {10}^6}{2\times 3.14\times 0.5287\times {10}^{-10}}$

$=6.6\times {10}^{15}$Hz.

$T=\frac{1}{f}=\frac{1}{6.6\times {10}^{15}}=0.15\times {10}^{-15}$sec.