Q.

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

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a

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

b

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

c

Microwaves are heat waves, so always produce heating

d

Infra - red waves produce heating in an electron

answer is A.

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Detailed Solution

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Frequency of water molecule is equal to frequency of microwave when it heats up a food containing water molecules.

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