A Collection of Atoms Has 20% of the Sample in a State

question 20

Multiple Choice

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? (c = 3.00 × 10⁸ m/s,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

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