Thursday, November 14, 2019
Radio Waves :: physics radio wave
Radiowaves are the oscillations of magnetic waves by varying the modulation to generate different signals which can be converted into information such as sound, video, or digital communication. As these waves pass through a conductor, an alternating current is generated and this can be converted into usable information. As one could see from the picture above, radio waves are the the electromagnetic waves with wave lengthes between 1mm and 10 Mm. This converts to a frequency range of 300Ghz to 30Hz, respectively. Nearly everyone uses radio waves in some form day after day. The technologies that depend on them is vast and ever-growing. These technologies range from cordless phones and garage door openers to radar and microwave ovens. Radio is not a dead technology either. It is constantly having research devoted to it and new technologies and innovations are coming about from this research. The trend towards wireless internet and more versatile cellular phones are just some examples. Ironically, the fundamentals of radio waves is relatively simple (atleast when compared to the vast array of technologies that now implement it). Cordless phones use radio waves to allow individuals to walk around freely in their home without the need to be bound by a cord while talking over their land-based phone line. Cell phones are a miracle to modern day living. Unlike previous eras where communication was done strictly across a hard-wired telephone line, cell phones now give the freedom to those that can afford them a radio-based uplink to the rest of the world. Not only are they for voice communication, but they also allow for transmission of virtually any kind of digital data. Microwave ovens are another great invention from the 20th century. They use radio waves in a specific frequency range in which water, fat, and sugar molecules happen to absorb and convert directly into heat.