Question
The condition under which a microwave oven heats up a food item containing water molecules most efficiently is
-
the frequency of the microwave must match the resonant frequency of the water molecules
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the frequency of the microwave has no relation with natural frequency of water molecules
-
microwave are heat waves, so always produce heating
-
infrared waves produce heating in a microwave oven
Solution
A.
the frequency of the microwave must match the resonant frequency of the water molecules
It is an electromagnetic wave, therefore the correct choice is (a).
