Radio Essay & Paragraph
Radio was a marvel of science. It was the main means of getting instant news. Gradually radio became also a source of entertainment. It plays a huge role in shaping public opinion and creating public awareness. It affects our language, our customs and, above all, our lives in many ways. Below is a bunch of essays and paragraphs about radio, outlining its technology, importance, and how it works.
Essay on Radio: Technology, Invention, Uses & How it Works
Introduction: Radio is a wonderful invention of science. It enables people to send and receive live voices from one distant place to another.
History of Invention: Guglielmo Marconi, an Italian scientist is credited with the invention of the radio in December 1901. Radio aroused worldwide excitement when he received the first transatlantic radio signals in St. John’s, Newf. The wireless signals were sent from a transmitter in England. It is said that Bengali scientist Jagadish Chandra Bose made valuable contribution in the invention of radio.
Radio messages and signals travel across space by way of electromagnetic waves. The existence of such waves was first postulated in 1873 by the Scottish physicist James Clerk Maxwell. A decade later the German physicist Heinrich Hertz proved the existence of radio waves.
How Radio Works: Radio waves radiate away from a center. When radio waves are generated, they spread out from the transmitting antenna in all directions at the speed of light—about 186,000 miles (300,000 kilometers) per second. When the waves encounter a receiving antenna, they cause electrons in the antenna to surge back and forth, just as the water waves cause objects on the water to bob up and down. The electron surges are converted by circuits in a radio or television into light or sound to reproduce the transmitted audio or video signal.
Historical Background of Broadcasting: The first known radio broadcast in the United States was carried out by Reginald A. Fessenden from an experimental station in Brant Rock, Massachusetts, on December 24, 1906. This Christmas Eve program included music from phonograph records, a violin solo, and a speech by the inventor. For several years radio remained a communication medium, devoted to sending and receiving messages rather than a medium of entertainment. It proved essential to the armed forces during World War I. The broadcasting potential of radio was first realized by David Sarnoff after World War I. In 1916 he envisaged the possibility of a radio receiver in every home. Great Britain’s first successful broadcasts were made in 1919. The British Broadcasting Corporation (BBC) was chartered by Parliament as a government monopoly in 1925.
In Europe regular broadcasting began at The Hague, The Netherlands, in 1919. Experimental stations went on the air in Denmark in 1921. Radio broadcasts began in Montreal, Quebec, in 1920, in Paris in 1922, in New Zealand in 1921, and in Sydney, Australia, in 1923. In India, Bombay and Calcutta had radio stations by 1927. Most programming contained news, commentary, lectures, forums, and music. In the Soviet Union broadcasting began in 1922. There programs were confined to cultural interests or to government propaganda.
Uses of Radio Technology: Radio technology has varied uses. Some of them are as follows:
1. In the earliest practical application, radio was used primarily to exchange messages with ships at sea. Radio is still used for this purpose and for communication across oceans.
2. Television, a very popular form of entertainment, is actually a kind of radio. It uses special equipment for sending and receiving pictures in the form of radio signals. The television audio signals are received by equipment similar to that used in other forms of radio. Other home devices like cordless telephones, garage door openers, and radio-operated toy airplanes and cars also use radio technology.
3. Radio technology provides a means of instant communication with moving vehicles such as taxicabs or service trucks. Police and fire departments use two-way radios to get information to and from officers in squad cars and on motorcycles. Observers in airplanes can report traffic violations, accidents, and traffic jams by radio to police officers on the ground. Many people in the medical profession use beepers. They are portable electronic devices used to page the person who carries it. The device is activated when it receives a special radio signal.
4. Though local telephone communication is carried by electrical signals in coaxial cable systems, long-distance calls are often made with radio signals. In cellular mobile telephones, voice signals are sent across town or over long distances by high-frequency radio signals called microwaves. Land-based microwave relay stations and communication satellites orbiting the Earth receive and transmit the microwave signals.
5. Airplane pilots use radios to guide them. With such aid they can fly through fog or storms and land safely at airports. Pilots and ship captains use radio navigation systems to determine their locations and stay on course.
6. Radio technology is not limited to the transmission of audio signals. Video signals from television cameras are sent by radio waves as well. Radio technology is used to send news and photographs around the world almost instantly. Telemetry is the process of gathering physical data by radio.
7. Radio technology is also used in space exploration. Space probes use radio waves to relay information about the solar system. Pictures of Jupiter, Saturn, Uranus, and Neptune were sent by radio signals from the Voyager space probes. Even without spacecraft, radio has helped us understand our universe. Radio astronomy is used to detect celestial objects too distant and dim to be seen by optical telescopes. It can also be used to determine the chemical makeup of stars and gas clouds and the speed and direction of moving stars. With the information about the outer ends of the universe received by radio astronomy, scientists can piece together the puzzle regarding the beginning of the universe.
Importance of Broadcasting: Radio is a means of affordable entertainment and a source of news and information. Even in this age of television entertainment, radio has maintained a position. A radio receiver is a very small and portable device, which anybody can carry with him. It has maintained its popularity among the people of rural communities where electricity has not reached yet.
Demerits: Broadcasting can be used for evil purpose too. Radio stations can broadcast false or prejudiced news serving special party interest. Such acts can harm us a lot.
Conclusion: There is no doubt about the importance of radio technology and broadcasting. If this technology is used honestly and for good purpose only, it can do us endless good. So, it should be ensured that radio is used in the positive way only.
Radio Technology Paragraph, 150 Words
The radio is a wonderful invention of science. It enables people to send and receive live voices from one distant place to another. Guglielmo Marconi, an Italian scientist is credited with the invention of the radio in December 1901. Radio aroused worldwide excitement when he received the first transatlantic radio signals in St. John’s, Newf. The wireless signals were sent from a transmitter in England. It is said that Bengali scientist Jagadish Chandra Bose made a valuable contribution to the invention of the radio. Radio is a means of affordable entertainment and a source of news and information. Even in this age of television entertainment, radio has maintained a position. A radio receiver is a very small and portable device, which anybody can carry with him. It has maintained its popularity among the people of rural communities where electricity has not reached yet.
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