Microwaves
Microwaves are sometimes considered to be very short radio waves (highfrequency and high-energy radio waves).
Some important properties of microwaves are:
They are reflected by metal surfaces.
They heat materials if they can make atoms or molecules in the material vibrate. The amount of heating depends on the intensity of the microwave radiation, and the time that the material is exposed to the radiation.
They pass through glass and plastics.
They pass through the atmosphere.
They pass through the ionosphere without being reflected.
They are absorbed by water molecules, how well depends on the frequency (energy) of the microwaves.
Transmission is affected by wave effects such as reflection, refraction, diffraction and interference.