9
Substances absorb Far IR energy most efficiently through the mechanism of . Which leads to heating of the
product
EXPLANATION
Infrared & Microwave Dairy Processing
- Far-Infrared (FIR) Heating Mechanisms:
- Far-Infrared (FIR) radiation spans wavelengths from $3\,\mu\text{m}$ to $1000\,\mu\text{m}$.
- The fundamental vibrational frequencies of chemical bonds (stretching and bending of $O-H$ in water, $C-H$, and $C=O$ bonds in organic biomolecules) fall precisely within the infrared spectral region ($2.5-15\,\mu\text{m}$).
- Absorption of FIR photons excites molecular vibrations (stretching, bending, rocking), which rapidly dissipates into kinetic thermal energy, heating the food product efficiently.
- Molecular rotation is excited primarily by microwave radiation.
- Correct Option: Option 2 (Molecular vibration).
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