INTRODUCTION:
Communication is the exchange of development between individuals or systems through codes, symbols, or behaviour. It is a play that people do every day and cannot screw without. first information systems appropriate for long distance communication hold hieroglyphs, message sticks, semaphores, and snail-mail (any mail that is physically delivered by postal service.) These systems cogitation by using objects to physically or visually put across a message or messages. Today, various technologies have amend our communication systems. These systems technologies transform energy into other forms useable to the society.
The discovery of electromagnetic waves is one of the greatest theoretical achievements in natural philosophy in the 19th century. Electromagnetic waves have a swan of frequencies and wavelengths.
A number of researches and studies have been undertaken before the concept of electromagnetic waves was understood and accepted. Electromagnetism was born when Hans Christian Oersted found license showing the relationship between electric carity and magnetism. One change surface in April 1820, Oersted was preparing an experiment for his class when his curiosity pushed him to do something. He placed a compass near a live electrical wire attached to a voltaic pile.
When he turned on the voltaic pile, the needle of the compass deflected and pointed towards the electric wire. Surprised by the outcome, he repeated experiment several(prenominal) times and got the same result.
To understand how electromagnetic waves are produced, it is beat out to understood first how the movement of a charge affects the frigid charge. Recall that there are two charges: negative (-) and confident(p) (+). Just like magnets, arctic charges attract and like charges repel.
If a magnet has magnetic field, an electric charge when its contrary charge has an electric field. What happens if there are two opposite charges? What will happen to a charge when its opposite...If you want to beguile a full essay, order it on our website: Orderessay
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