The use of radio waves and signals beyondPresentation Transcript
THE USE OF RADIO WAVES By Joseph AND SIGNALS BEYOND Thomas BROADCASTING
WHAT ARE RADIO WAVES ? Radio waves are electromagnetic radiation within an invisible form that dif fers 100,00km to a millimetre in terms of wavelength. It is one of the broadest assortments in the electromagnetic spectrum. Audio, images, and text in the form of signals are just some of the capabilities of the ‘Radio’. Both Nikola Tesla and Guglielmo Marconi Nikola Tesla are credited with being some of the first innovators in the expanse of radio. Frequency refers to how long the measured time is between the crest and trough of a wave arriving at the source. The frequency is in the 450 -750 terahertz range in visible light, meaning 450-750 crests and troughs pass through a detector in a single second of waves .
ELECTRO MAGNETIC SPECTRUM The image below is the electromagnetic spectrum , as you can see the radio has the least amount of energy , but the highest increase of wavelength.
THE DIFFERENCES IN ‘AM’ AND ‘FM’ Both AM and FM are two methods for delivering embedded in a carrier frequency and signals. ‘AM’ is short for ‘amplitude modulation’. In this technique, the amplitude or height of the carrier signal increases and decreases as the base signal changes. AM radio signals travel great distances so that a single transmitter can cover over large areas. ‘FM’ is short for ‘Frequency Modulation’ . The frequency of the carrier signal increases and decreases in order to represent the change in voltage of the overall base signal. ‘FM’ signals offer better signal quality than ‘AM’ but have far less range, this leads to demanding multiple transmitters to cover the same area as it would take to cover one transmitter for ‘AM’.
THE USES OF RADIO WAVES These are just some of the main uses of radio waves today , some of them we use on a daily basis . Mobile Phones Radio Microwaves Radars Walky -talky Wi-Fi
WI-FI Wi-Fi is short for Wireless networking, many people use wireless networking, also known as 802.11 networking, to connect their computers within their own home, and even some cities are trying to use the technology in order to provide low -cost Internet access to citizens. In the near future, wireless networking may become so extensive that you can access the Internet just about anywhere at any time. Wi-Fi has a number of dif ferent advantages. Wireless networks are informal to set up and inexpensive. Theyre also discreet -- unless youre on the lookout for a place to use your specific laptop , and wire – free !
MICROWAVES M-icrowave oven uses radio waves in order to heat specific foods. In the case of microwave ovens, the commonly used radio wave frequency is roughly 2.5 gigahertz . within this frequency range , radio waves have an interesting property, they are absorbed by sugar, water and fats. When absorbed they are converted into atomic motion -- heat.