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

1. Ultraviolet
2. Microwaves
3. Infrared
4. Radio waves

Correct answer: Infrared

Solution

Molecular vibrational transitions typically absorb infrared radiation because the photon energies match vibrational energy gaps. Ultraviolet is generally associated with electronic transitions, while microwaves are more related to rotational transitions.

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