Radio waves have wavelengths ranging from thousands of metres down to around 30 cm. This means they can easily travel around large objects, like hills, mountains or buildings. Microwaves have ...

Over great distances that gas and dust absorb many types of radiation but radio waves pass through nearly unimpeded. For interstellar communication, a particular range of radio frequencies, ...

which can then be decoded when the wave is received. Television and radio systems use this principle to broadcast information. Microwaves are used for cooking food and for communications.