Radio
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.
Importamce 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.
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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