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