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The following graph is pictorial representation of _________

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The following graph is pictorial representation of _________

(a) Spontaneous emission

(b) Spontaneous Absorption

(c) Stimulated emission

(d) Stimulated Absorption

The question was posed to me at a job interview.

My doubt is from Introduction and Applications of Laser in section Laser of Engineering Physics II

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Best answer
The correct choice is (c) Stimulated emission

To elaborate: The diagram shows that when a photon from the incident radiation, having energy E2 – E1, interacts with the atom in excited state, the atom comes down to the ground state with the emission of a photon with same frequency, phase and direction of propagation.

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