The correct answer is: B. Stimulated emission.
Stimulated emission is a process in which an atom or molecule in an excited state is stimulated by a photon of the same frequency to emit a second photon of the same frequency. This process is the basis of laser operation.
Blackbody radiation is the electromagnetic radiation emitted by a black body, an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. The radiation is characterized by a continuous spectrum that peaks at a wavelength that depends on the temperature of the black body.
Planck’s radiation law is a law that describes the spectral distribution of electromagnetic radiation emitted by a black body. The law was first proposed by Max Planck in 1900, and it is one of the most important laws in quantum mechanics.
Einstein oscillation is a process in which an atom or molecule in an excited state
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