Physics - Modern Physics Question with Solution | TestHub

Paragraph:In a mixture of $\mathrm{H}-{\mathrm{H}}^{+}$gas $({\mathrm{He}}^{+}$is singly ionised $\mathrm{He}$ atom), $\mathrm{H}$ atoms and ${\mathrm{He}}^{+}$ions are excited to their respective first excited states. Subsequently, $\mathrm{H}$ atoms transfer their total excitation energy to ${\mathrm{He}}^{+}$ions (by collisions). Assume that the Bohr model of atom is exactly valid.Question:The ratio of the kinetic energy of the $n=2$ electron for the $\mathrm{H}$ atom to that of ${\mathrm{He}}^{+}$ ion is