A) If both the assertion and reason are true and reason explains the assertion.
B) If both the assertion and reason are true but reason does not explain the assertion.
C) If assertion is true but reason is false.
D) If assertion is false but reason is true.
Correct Answer: B
Solution :
The transition in He-Ne laser is show below The electric discharge in the gas pumps the helium atoms to higher energy states (which is metastable state \[\approx {{10}^{-8}}s\]) These the atoms collide with the ground state Neon atoms and excite to higher states and produce an inverted population inversion causing a unidirectional photon beam (laser light)You need to login to perform this action.
You will be redirected in
3 sec