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At the state when N1 > N2, the intensity of light wave _____________

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At the state when N1 > N2, the intensity of light wave _____________

(a) Increases linearly

(b) Increases exponentially

(c) Decreases linearly

(d) Decreases exponentially

I got this question by my school principal while I was bunking the class.

This key question is from Population Inversion in portion Laser of Engineering Physics II

1 Answer

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Right answer is (d) Decreases exponentially

The explanation is: When N1 > N2, the population of atoms in the ground state is higher than that in the exited state. In this case, absorption is dominant and hence, the intensity of light wave decreases exponentially.

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