A collection of atoms has 20% of the sample in a state above the ground state.If these emit coherent radiation,what is the wavelength of the laser light produced?
,h = 6.626 × 10-34 J ∙ s,1 eV = 1.60 × 10-19 J)
A) 210 nm
B) 91 nm
C) 340 nm
D) 34 nm
Correct Answer:
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