Question 209: EM waves

Question

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

Accepted Answer

The natural frequency of vibration of the water molecules in the food item should be same as that of the frequency of microwaves.

Answer

Microwaves are heat waves, so always produce heating.

Answer

Infra-red waves produce heating in a microwave oven.

Answer

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

Answer

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

EM waves