What is stimulated emission?
a. the process of distinguishing between sources of electromagnetic waves.
b. the process of reducing mechanical waves' energy.
c. the process of amplifying sound waves.
d. producing move light waves which are coherent with an incident light wave.
Is this b?
no
No, stimulated emission is not the process of reducing mechanical waves' energy. Stimulated emission refers to a process in which an atom or molecule in an excited state is stimulated by an incoming photon to emit another photon with the same properties (i.e., frequency, phase, direction) as the incident photon. This results in the production of additional photons that are coherent with the original incident photon.
In the given options, stimulated emission is best described by option d. Producing more light waves which are coherent with an incident light wave.