Question

How are microwaves produced? Why is it necessary in microwave ovens to select the frequency of microwaves to match the resonant frequency of water molecules?

Answer 1

Microwaves:

1. Microwave is the form of electromagnetic wave with frequencies in the range of 300 MHz to 600 MHz.

How are Microwaves produced:

1. Microwaves are produced by vacuum tube devices that operate on the ballistic motion of electrons controlled by magnetic or electric fields.
2. Microwaves are used in microwave ovens for cooking and heating purposes.
3. It is necessary to select microwave frequency in a microwave oven as the resonant frequency of a water molecule to transfer the energy of high-energy photons of microwave as kinetic energy of the water molecule.
4. As a result the thermal energy of the water molecules increases.
5. This results in cooking and heating food.