In Helium-neon Laser, in meta stable state, helium is located at the energy level: a) 20.66 eV b) 20.77 eV c) 20.61 eV d) 20.71 eV

In Helium-neon Laser, in meta stable state, helium is located at the energy level:
a) 20.66 eV b) 20.77 eV c) 20.61 eV d) 20.71 eV
by

1 Answer

Answer :

c) 20.61 eV
by

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