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Question

Physics Question on Atoms

If the protential energy of the electron in the hydrogen atom is −Ke2r,\frac {-Ke^2}{r}, its kinetic energy is

A

−Ke22r\frac {-Ke^2}{2r}

B

−Ke2r\frac {-Ke^2}{r}

C

Ke22r\frac {Ke^2}{2r}

D

Ke2r\frac {Ke^2}{r}

Answer

Ke22r\frac {Ke^2}{2r}

Explanation

Solution

Kinetic energy of electron in hydrogen atom =Ke22r=∣U∣2=\frac {Ke^2}{2r}= \frac {|U|}{2}