Rarefied Hg gas whose atoms are practically all in the ground state was lighted by a mercury lamp emitting a resonance line of wavelength 253 65 rim As a result, the radiation power of Hg gas at that wavelength turned out to be P 35 mW Find the number of atoms in the state of resonance excitation w...

As a result of the lighting by the mercury lamp a number of atoms are pum ...

Rarefied Hg gas whose atoms are practically all in the ground state was lighted by a mercury

Question:

Rarefied Hg gas whose atoms are practically all in the ground state was lighted by a mercury lamp emitting a resonance line of wavelength λ = 253.65 rim. As a result, the radiation power of Hg gas at that wavelength turned out to be P = 35 mW. Find the number of atoms in the state of resonance excitation whose mean lifetime is z = 0.15μs.