Electromagnetic Modes in a Microwave Cavity

Electromagnetic waves can form standing patterns inside a cavity. Household microwaves and lasers are common examples of this effect. When two conducting metal plates are placed parallel at the nodal planes, they create a space where standing waves can exist.

The cavity between the plates works l...

Microwave ovens use electromagnetic waves to heat food.

Most food items contain polar molecules like water, that flip back and forth with the alternating electric field. While flipping, the molecules undergo friction with other molecules, as a result, heat is generated.

The microwave chamber acts as a resonating cavity where standi...