to be able to communicate in wars such as world war I and II.
The Telegraph Required Wires The Radio Did Not
the person next to uses the radio to listen to it
He did some early experiments with radio in Canada, and he may have transmitted before Marconi in Italy.
lighting lamps and heating homes
it doesn't, it uses microwaves
bluetooth is an open wireless protocol for exchanging data over short distances. it uses short length radio frequencies. bluetooth uses a radio technology called frequency-hoping spread spectrum.
It uses radio waves. The frequency band is the same as some cordless telephones.
Lighting, heating, radio, TV, computers, phones, internet, medical electronics are some examples.
anybody on earth
hearing FM and am news in radio
Radio-sodium is used to check action of medicines
A radio typically uses electrical energy from a battery or power outlet to function. The electrical energy powers the components inside the radio, such as the circuitry, speaker, and tuning mechanisms, allowing it to receive and amplify radio signals to produce sound.