In which one of the following regions of the electromagnetic spectrum will the vibrational motion of molecules give rise to absorption?

Ultraviolet

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Microwaves

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Infrared

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Radio waves

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Solution

The correct option is B Microwaves
Molecular spectra due to vibrational motion lie in the microwave region of electromagentic spectrum. Due to Kirchhoff's law in spectroscopy the same will be absorbed.

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