Question

When an electron falls from a higher energy to a lower energy level, the difference in the energies appears in the form of electromagnetic radiation? Why can't it be emitted as other forms of energy?

Answer 1

Hint: Here electrons have transitioned from higher to lower energy level and its energy difference appears in the electromagnetic radiation. We have to give the reason why it is so and why it emitted energy can’t be in any other form. So we will discuss energy associated with electrons and about electromagnetic radiation.

Complete answer:
An electron is a fundamental particle which has mass as well as charge and when it comes back from higher energy level to lower energy level it emits a photon. The photon which is emitted has the excess amount of energy or we can say it has the energy which was given to electrons to get excited to a higher level.
Now these photons are the quantised energy or a packet of energy which has an electromagnetic field and so these photons radiate energy in the form of electromagnetic radiation.
Also electromagnetic radiation is the radiation due to propagation of energy in the form of waves or photons or quanta.
As electrons emit photons while falling from higher energy level to lower energy level and photons are associated with electromagnetic fields it can emit energy only in the form of electromagnetic radiation.

Note:
Electrons which are excited to a higher level, after staying there for a while, fall back to its initial orbital. Therefore, the energy which is emitted in the form of photons is equal to the energy which is provided to electrons to get into an excited state. The energy radiated lies in the range of electromagnetic spectra therefore it is called electromagnetic radiation.