First slide

Electromagnetic spectrum

Question

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

Easy

A

Ultraviolet
B

Microwaves
C

Infrared
D

Radio waves

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 be
absorbed.

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