Population Inversion Is Important for the Generation of a Laser

question 2

Multiple Choice

Population inversion is important for the generation of a laser beam because it assures that:

• A)spontaneous emission does not occur more often than stimulated emission
• B)photons do not split too rapidly
• C)more photons are emitted than are absorbed
• D)photons do not collide with each other
• E)photons do not make upward transitions

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