The frequency of revolution of an electron revolving in the $n^{th}$ orbit of an $H$-atom is proportional to:

In a hydrogen atom,which quantity is an integral multiple of $\frac{h}{2\pi}$?

An electron in the ground state of the hydrogen atom has an orbital radius of $5.3 \times 10^{-11} \ m$,while that for the electron in the third excited state is $8.48 \times 10^{-10} \ m$. The ratio of the de Broglie wavelengths of the electron in the ground state to that in the third excited state is:

The radius of a certain orbit of a hydrogen atom is $8.48 \mathring{A}$. If the energy of the electron in this orbit is $E/x$,then $x = . . . .$
(Given $a_0 = 0.529 \mathring{A}$,$E =$ energy of the electron in the ground state)

$A$ hydrogen atom at rest emits a photon during its transition from $n = 2$ to $n = 1$. Choose the $INCORRECT$ statement.

In the Bohr model of the hydrogen atom,the force on the electron is proportional to which power of the principal quantum number $n$?