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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Definitions:

Stabilizing Selection

A type of natural selection that favors the average individuals in a population and reduces variation around the mean phenotype.

Gene Pool

All the alleles of all the genes in a population; a pool of genetic resources.

Bottleneck Effect

A sharp reduction in the size of a population due to environmental events or human activities, resulting in a decrease in genetic diversity.

Gene Pool

The complete set of unique genes within a population or species, constituting the genetic diversity that can be passed through reproduction.