The condition under which a microwave oven heats up a food item containing water molecules most efficiently is (a) Microwaves are heat waves, so always produce heating. (b) Infra-red waves produce heating in a microwave oven. (c) The frequency of the microwaves must match the resonant frequency of the water molecules. (d) The frequency of the microwaves has no relation with natural frequency of water molecules.

Answer: (c). Microwave energy is absorbed best when its frequency matches the natural (resonant) frequency of water molecules. Then energy transfer to the molecules' kinetic energy is maximum, heating the food. So the answer is (c).

The condition under which a microwave oven heats up a food item… | NEET 2013

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Electromagnetic Spectrum & Atmosphere

The condition under which a microwave oven heats up a food item containing water molecules most efficiently is

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Answer: (c)

Microwave energy is absorbed best when its frequency matches the natural (resonant) frequency of water molecules.
Then energy transfer to the molecules' kinetic energy is maximum, heating the food.
So the answer is (c).

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