The orbital angular momentum ($L$) of an electron in an orbital is determined by the azimuthal quantum number ($l$) according to the expression: $L = \sqrt{l(l+1)} \frac{h}{2\pi}$

For a p-electron, the value of the azimuthal quantum number $l = 1$ . Substituting this value into the formula: $L = \sqrt{1(1+1)} \frac{h}{2\pi}$ $L = \sqrt{2} \frac{h}{2\pi}$ $L = \frac{h}{\sqrt{2}\pi}$

Note: The value $l=0$ corresponds to s-orbitals, $l=2$ to d-orbitals, etc.