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Which of the following transition corresponds to the far-infrared region?(a) Electronic(b) Vibrational(c) Rotational(d) MechanicalI have been asked this question during an online interview.This intriguing question originated from Measurement of Volume topic in section Pulmonary Function Analysers of Biomedical Instrumentation

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Right answer is (c) ROTATIONAL

Easiest explanation: Electronic TRANSITIONS correspond to the ultraviolet and visible regions, vibrational transitions to the near INFRARED and infrared regions and rotational transitions to the infrared and far-infrared regions. The method based on the ABSORPTION of RADIATION of a substance is known as Absorption Spectroscopy.



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