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

Options

A. The frequency of the microwaves must match the resonant frequency of 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 a microwave oven

Answer

A

Explanation

In the presence of microwave water molecules oscillates the frequency of microwave and large heat is developed.