JEE Main 2022 — Structure of Atom Question with Solution

An electron can move only in those orbits for which its angular momentum is integral multiple of $\frac{\mathrm{h}}{2\mathrm{\pi }}$. That means angular momentum is quantised. Radiation is emitted or absorbed only when transition of electron takes place from one quantised value of angular momentum to another. Therefore. Maxwell's electromagnetic theory does not apply here that is why only certain fixed orbits are allowed. Atomic orbital is characterised by $\mathrm{n},\mathrm{l},\mathrm{m}$. So, the option D is incorrect.