In order for a picture to be sent over a distance, it has to be sent as an electrical signal. This can be done only if the scene is broken down into many parts. The many parts must then be put together again after the electrical signal has been

Radio waves are one type of electromagnetic wave which travels through the air or a vacuum. They spread out from the source in much the same way as ripples move across water when a stone is dropped into a pond. The person who first discovered

“The important discovery of the transistor was made on December 23, 1947, by Walter Brattain, William Shockley, and John Bardeen of Bell Telephone Laboratories. They found that the flow of electricity could be controlled with a small device