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← ScienceWhich mechanism allows a microwave oven to heat food containing water molecules?
A)Dielectric heating due to polar molecule rotation✓
B)Convection currents induced by thermal gradients
C)Resistive heating from ionic conduction
D)Infrared absorption via vibrational excitation
💡 Explanation
When exposed to microwaves, water molecules (polar) rotate rapidly as they attempt to align with the oscillating electromagnetic field, creating heat through dielectric heating due to intermolecular friction. Therefore, dielectric heating results, rather than convection, resistance or IR effects which require different molecular properties or radiation types.
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