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Electromagnetic Waves question

2013 · Q131
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Electromagnetic Waves question

2013 · Q131

NEETPhysicsElectromagnetic WavesMCQ+4 / −1
The condition under which a microwave oven heats up a food item containing water molecules most efficiently is
  1. A
    Microwaves are heat waves, so always produce heating.
  2. B
    Infra-red waves produce heating in a microwave oven.
  3. C
    The frequency of the microwaves must match the resonant frequency of the water molecules.
  4. D
    The frequency of the microwaves has no relation with natural frequency of water molecules.
View written solutionFree

Correct answer: C

The natural frequency of vibration of the water molecules in the food item should be same as that of the frequency of microwaves.

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