NCERT Solutions for Chapter: Atoms, Exercise 1: MCQ

An ionised H-molecule consists of an electron and two protons. The protons are separated by a small distance of the order of angstrom. In the ground state,

Consider aiming a beam of free electrons towards free protons. When they scatter, an electron and a proton cannot combine to produce a H-atom,

The Bohr model for the spectra of a H-atom

The Balmer series for the H-atom can be observed

Let $E_n=\frac{-1}{8{{\epsilon }_0}^2}\frac{m{e}^4}{n^2{h}^2}$ be the energy of the $n^{th}$ level of H-atom. If all the H-atoms are in the ground state and radiation of frequency $(E_2-E_1)/h$ falls on it,

The simple Bohr model is not applicable to $H{e}^4$ atom because