7.
In the helium-neon laser, which of the following is not true?
A:
The laser transition occurs in helium atom
B:
The purpose of the helium atom is to help achieve a population inversion in the neon atoms
C:
There is stimulated emission as well as spontaneous emission in the Neon atoms
D:
The metastable state occur in both the Helium and Neon atoms.
The answer is:
A