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

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The frequency of the microwaves must match the resonant frequency of the water molecules

The frequency of the microwaves has no relation with natural frequency of water molecules

Microwaves are heat waves, so always produce heating

Infra -red waves produce heating in a microwave oven.

answer is C.

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Detailed Solution

Water molecules are polar in nature, therefore, they rotate and try to align themselves in electric field.
Microwaves cause water molecules in food to vibrate and produce heat that cooks the food. The natural frequency of water molecules matches the frequency of microwaves.
The frequency of microwaves will be in resonance with water molecules.

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