The radius of the Bohr orbit depends on which of the following?

The period of revolution of an electron in the ground state of the hydrogen atom is $T$. The period of revolution of the electron in the first excited state is

Show that the total energy of an electron in an atom is negative and is,

$\mathrm{E}=-\frac{{\mathrm{e}}^2}{8{\mathrm{\pi \epsilon }}_0}$.

What is the significance of negative energy?

State the postulates of Bohr atom model. Obtain the expression for the radius of the ${\mathrm{n}}^{\mathrm{th}}$ orbit of an electron based of Bohr's theory.

The energy of electron in the excited state of hydrogen atom is $-0.85 \mathrm{eV}$. If $\text{'}\mathrm{h}\text{'}$ is Planck's constant, the angular momentum of electron in the excited state is:

Niels Bohr made certain modification in Rutherford's model by adding the ideas of quantum hypothesis.

Derive an expression for the radius and energy of the electron in the ${\mathrm{n}}^{\mathrm{th}}$ orbit of hydrogen atom.