In Laser Opto-acoustic spectroscopy, the IR beam excites the molecules – McqOptions

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1.	In Laser Opto-acoustic spectroscopy, the IR beam excites the molecules to higher states. In which of the following ways do the molecules return to the ground state?
A.	Collisional de-excitation
B.	Random de-excitation
C.	By spontaneous emission
D.	By stimulated emission
Answer» B. Random de-excitation

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