When you ask somebody to pick out the correct answer for you from a list,
it would be just plain common courtesy to let him see the list.
Broadcast Radio
WiFi modems, highway toll transponders, and Bluetooth® thingies do that.
so people could communicate over long distances
broadcast
-- It's easy and cheap to generate radio signals and put information on them. -- It's easy and cheap to detect radio signals at a great distance and recover the information from them. -- It's easy and cheap to pick out the radio signal you want from thousands of other signals. -- Radio can deliver information over great distances significantly faster than carrier pigeons, surface mail, runners, smoke signals, jungle drums, or optical fiber can.
Amplitude Modulation and Frequency Modulation. They are different methods of transmitting radio signals. AM is good for transmitting radio signals long distance FM is good for transmitting radio signals short distances but better quality
Broadcast Radio
Broadcast Radio
WiFi modems, highway toll transponders, and Bluetooth® thingies do that.
so people could communicate over long distances
broadcast
-- It's easy and cheap to generate radio signals and put information on them. -- It's easy and cheap to detect radio signals at a great distance and recover the information from them. -- It's easy and cheap to pick out the radio signal you want from thousands of other signals. -- Radio can deliver information over great distances significantly faster than carrier pigeons, surface mail, runners, smoke signals, jungle drums, or optical fiber can.
It made it possible to amplify weak radio signals and transmit them over long distances
The first radio was invented by gugliemo marconi but jc Bose who first showed that radio signals could be sent over long distances without wires. Radio was invented in i921.Ansered byvaibhav gupta
Bluetooth, WiFi, and remote-lock car keys do that.
bluetooth
They are called as radio waves. They have got the speed of light. The wave length of the radio wave may be up to few kilometers.