Question

Assertion In He-Nelaser, population inversion takes place between energy levels of neon atoms.
Reason Helium atoms have a metastable energy level.
A. Both assertin and reason are true and reason is the correct explanation of assertion
B. Both assertion and reason are true but reason is not the correct explanation of assertion
C. Assertion is true but reason is flase
D. Both assertion and reason are false

Answer 1

Correct Answer - B
The transition in He Laser is shown below

An electric discharge is the gas pump the helium atom to hgher energy states .These He atoms collide with the ground state atoms and excite to higher states and prodcue population inversion causing a directional photon beam.