Question

In the case of the Bohr atomic model if $E_K$ and $U$ are the kinetic and potential energies of an electron in an orbit then:

• A. $E_K+U=0$
• B. $E_K-U=0$
• C. $2E_K+U=0$
• D. $E_K+2U=0$

Answer 1

Answer: (C)

$2E_K+U=0$

According to Bohr atom model, $U$ is negative and $K$ is +ve.

More over $E_K=-\frac{1}{2}\left|U\right|$
$\Rightarrow 2E_K+U=0$