Nikola Tesla invented the fundamentals for the radio transmission a wireless telephonic device that operated electromagnetically at audio frequencies
Radios have been one of the more important technological devices for more than a century. From their beginnings in the early 1800’s until the new developments in recent years, radios have helped to provide communication as well as entertainment throughout the society of many cultures.
The early years of the radio technology began early in the 1800s, but the actual invention cannot be attributed to only one person. During this time period, several inventors created and improved upon the technology that became the radio as we know it today. Once referred to as “wireless telegraphy,” radio technology has always included electronic signaling between a transmitter and one or more receivers. In order to accomplish this, there are many several pieces of technology that fit together.
Radio waves (or radio frequency - RF) are an invisible yet essential part of our modern life. Radio waves were discovered more than 100 years ago and we often take todays technology for granted. Scientists have been studying the health effects of radio waves for more than 50 years. Radio waves are part of the electromagnetic spectrum which also includes light and heat and is used by all electrical equipment including television and radio stations as well as mobile phones.
Radio broadcast technology and radio broadcasting including analogue radio digital radio, analogue television and the many forms of digital television for terrestrial television, satellite television and mobile or handheld television
Sound consists of pressure variations in matter, such as air or water. Sound will not travel through a vacuum. Radio waves, like visible light, infrared, ultraviolet, X-rays and gamma rays, are electromagnetic waves that do travel through a vacuum When you turn on a radio you hear sounds because the transmitter at the radio station has converted the sound waves into electromagnetic waves, which are then encoded onto an electromagnetic wave in the radio frequency range (generally in the range of 500-1600 kHz for AM stations, or 86-107 MHz for FM stations)