The energy of an electron in an excited hydrogen atom is $-3.4 \;ev$ calculate the angular momentum of the electron according to Bohr's theory .

Question

$\begin{array}{1 1} 2.1 \times 10^{-34} \;Js^{-1} \\ 2.1 \times 10^{-34} \;Js \\ 2.1 \times 10^{-33} \;Js \\ 2.1 \times 10^{-33}\;Js^{-1} \end{array}$