The Electromagnetic Spectrum

The longest wavelength is the radiowave with a length of 10 to the power of 3 metres and the shortest wavelength is gamma which has a wavelength of 10 to the power of -12 metres. 

Radio waves

Radiowaves are used for communications and broadcasting.

Microwaves

Microwaves are used for cooking and for mobile phones/communications. They can be dangerous as they can heat body cells and kill body cells. 

Infrared

Infrered…