In a mixture of gas

PHYSICS · Single correct · CBSE · Physics · Atoms · Atoms

Problem

In a mixture of

\mathrm{H-He^+}

gas, where

\mathrm{He^+}

is a singly ionised helium atom, H atoms and

\mathrm{He^+}

ions are excited to their respective first excited states. Subsequently, H atoms transfer their total excitation energy to

\mathrm{He^+}

ions by collisions. Assume that the Bohr model of the atom is exactly valid. The ratio of the kinetic energy of the

n=2

electron of the H atom to that of the excited

\mathrm{He^+}

ion is (1)

\frac14

(2)

\frac12

(3)

1

(4)

2