The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom, is

Options

A. `1//2`
B. `-1//2`
C. `1`
D. `-1`

Answer

B

Explanation

`[{:(PE= - (Ze^(2))/(r_(n))","KE = (1)/(2)(Ze^(2))/(r_(n))),(E_(Total) = (-Ze^(2))/(r_(n)) + (1)/(2)(Ze^(2))/(r_(n)) = (-Ze^(2))/(r_(n))),(E_(Total) = (1)/(2) PE),(KE = - (1)/(2)PE):}]`
`(KE)/(PE) = (1)/(2)(Ze^(2))/(r_(n))//(-Ze^(2))/(2r_(n)) = - (1)/(2)`