Q.

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

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a

Ultraviolet

b

Microwaves

c

Infrared

d

Radio waves

answer is B.

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Detailed Solution

Molecular spectra due to vibrational motion lie in the microwave region of EM-spectrum. Due to Kirchhoff's law in spectroscopy the same will beabsorbed.
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In which one of the following regions of the electromagnetic spectrum will the vibrational motion of molecules give rise to absorption?