alleryIn a microwave oven, the frequency is chosen to match the resonant frequency of:
AWater molecules
BWooden mouldings
CWoollen materials
DWelded mountings
Answer & Solution
Correct answer: A. Water molecules
1. Food heats because something inside it absorbs the waves.
2. The absorber is the most common molecule in food.
3. The frequency is selected to match the resonant frequency of water molecules.
4. Energy then transfers efficiently to the kinetic energy of the molecules.
_Source: syllabus Physics Part I, Ch 8 'Electromagnetic Waves'_
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