Physics - Modern Physics Question with Solution | TestHub

According to Bohr's theory of the$\mathrm{H}$atom, electrons can revolve only in those orbits in which their angular momentum is an integral multiple of$\frac{h}{2\pi }$, where$h$is Plank's constant.

Angular momentum =$mvr$=$\frac{2h}{2\pi }$

Hence, angular momentum is quantized.

The energy of an electron in$n^{th}$orbit of the hydrogen atom,

$E =$$\frac{Rhc}{n^2}$$\mathrm{J}$

Thus, it is obvious that the hydrogen atom has some characteristics of energy state. In fact, this is true for the atom of each element,$ie,$each atom has its energy quantized.
Hence, both energy and angular momentum are quantised.