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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 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.
- the frequency of the microwaves must match the resonant frequency of the water molecules.
Correct Option: D
Required condition : Frequency of microwaves = Resonant frequency of water molecules.