The magnetic moment $(\mu)$ of an electron revolving around the nucleus varies with the principal quantum number $n$ as

The electron in a hydrogen atom makes a transition $n_1 \rightarrow n_2$,where $n_1$ and $n_2$ are the principal quantum numbers of the two states. Assume the Bohr model to be valid. The frequency of orbital motion of the electron in the initial state is $1/27$ of that in the final state. The possible values of $n_1$ and $n_2$ are

The acceleration of an electron in the first orbit of the hydrogen atom $(Z = 1)$ is

When a hydrogen atom is in its first excited level,its radius is .... of the Bohr radius.

In the Bohr model,an electron of mass $m$ moves in a circular orbit around the proton. Considering the orbiting electron as a circular current loop,find the magnetic moment of the hydrogen atom when the electron is in the $n$th orbit. (Assume $h$ is Planck's constant)

What is the angular momentum of an electron in the $n=5$ orbit of a $Be^{+3}$ ion?