The angular momentum of an electron moving in an orbit of hydrogen atom is $1.5\left(\frac{\mathrm{h}}{\mathrm{\pi }}\right)$. The energy in the same orbit is nearly.

According to Bohr’s postulates, angular momentum in any orbit is _____
$\mathrm{mvr}=\frac{\mathrm{nh}}{2\mathrm{\pi }}=1.5\frac{\mathrm{h}}{\mathrm{\pi }}=\frac{3\mathrm{h}}{2\mathrm{\pi }}$
n = 3, energy in the orbit
$=\frac{-13.6}{{\mathrm{n}}^2}=\frac{-13.6}{\mathrm{a}}=-1.5\mathrm{eV}$