NCERT Solutions for Chapter: Atoms, Exercise 2: VSA

The mass of a H-atom is less than the sum of the masses of a proton and electron. Why is this?

Imagine removing one electron from $H{e}^4$ and $H{e}^3$. Their energy levels, as worked out on the basis of the Bohr model will be very close. Explain why.

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 cannot it be emitted as other forms of energy?

Would the Bohr formula for the H-atom remain unchanged if proton had a charge $(+4/3)e$ and electron a charge $(-3/4)e,$ where $e=1.6\times {10}^{-19}C$. Give reasons for your answer.

Consider two different hydrogen atoms. The electron in each atom is in an excited state. Is it possible for the electrons to have different energies but the same orbital angular momentum according to the Bohr model?