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Q.

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

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a

Infrared waves produce heating in a microwave oven

b

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

c

The frequency of the micro waves has no relation with natural frequency of water molecules

d

Micro waves are heat waves, so they always produce heating

answer is B.

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Detailed Solution

For efficient working of micro wave oven the frequency of micro wave must match the resonant frequency of the water molecules then maximum heating produced
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