Physics - Cooking and communication using waves

All objects give out and take in infrared radiation. The hotter an object is, the more infrared radiation it emits.

Very hot objects may glow, such as the heating element in a toaster or an electric fire. Other hot objects may not glow, such as an iron.

Microwave radiation has lower frequencies and longer wavelengths than visible light. Microwaves cannot be seen, but they can cause burns if they are absorbed by body tissues. Microwave ovens rely on the ability of microwaves to…