🛠️ JEE🧲 Physics

Electromagnetic Waves

1 solved JEE Physics previous year questions on Electromagnetic Waves, each with the correct answer and a full explanation.

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

amicrowaves are heat waves, so always produce heating

binfra-red waves produce heating in a microwave oven

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

dthe frequency of the microwaves has no relation with natural frequency of water molecules.

✓ Correct answer: c) the frequency of the microwaves must match the resonant frequency of the water molecules

ExplanationIn a microwave oven, the frequency of the microwaves matches with the resonant frequency of water molecules so that the maximum heat can be transferred to food in most efficient way.Thus, the frequency of the microwaves must match the resonant frequency of the water molecules.

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