essay on radio-
essay-on-radio
essay-on-radio
Answers
Radio is a popular mass medium in almost all countries of the world. It has the maximum outreach. Almost everyone irrespective of economic background can afford to have a radio set.
It has the unique characteristic of speed and immediacy. It was thought in 1917 that mass education can be achieved through radio broadcasts. In India, the first radio station was established in Bombay in July 1927. Then the next station was set up in Calcutta and in Delhi, it was set up in 1936.
In India, the radio broadcast is done through All India Radio (AIR) services. School broadcasting was started in 1937 In Calcutta. Since then, the school broadcast has increased. Most AIR stations broadcast educational programmes for schools.
Effective Use of Radio:
The Radio medium is very effective for the broadcast of lectures by eminent educationists, scientists, historical statements, etc. It is a rich medium for the broadcast of drama, stories, commentary, sport news, educational news and educational programmes. Radio medium is popular in both urban and rural settings.
Radio programs are generally prepared on topics that are more suitable for verbal communication. Sound, music and special audio effects can be used in audio programmes to make them more effective. These techniques help to create visual images through sound. Non-broadcast mode (i.e. specially produced audio cassettes) is also useful in classroom instruction.
Institutions such as the Central Institute of Educational Technology, New Delhi, State Institute of Educational Technology, Educational Technology Cells of State Councils of Educational Research and Training produce need-based audio programmes for school children.
Answer:
Radio is one of the most wonderful gift of science. Radio sets are very popular. They can be found in every home. It has made us feel the world small.
It helps us in sending news and message without wires. We can enjoy news, music, songs etc. from different part of the world through it sitting in our houses.
We also get lessons on radio at school. The programmes are broadcast all the twenty four hours from radio. Film songs and children programmes are of much interest.
Radio is also a powerful means of teaching. In short the radio is of great use and interest to all of us. Now we have pocket radios which are very convenient to carry.
On a standard radio, there are two bands you can switch to AM and FM. FM stands for frequency modulation, and AM stands for, amplitude modulation. The difference between the two bands is the way they are broadcasted. AM is being amplitude modulation the pitch of the radio waves are based on the amplitude of the wave. So, for example, if the amplitude is the higher, the pitch will be the higher. As for FM, as the waves aren’t based on the amplitude, they are based on the frequency of the waves. So, the more frequent the waves are, the higher the pitch of the sound will be.
A radio works by using an antenna, which intercepts part of the radio waves. A signal voltage across the coil induces a voltage in the coil, the frequency (AM, FM) is then chosen by the variable capacitor. The capacitor in the circuit is only tuned for AM. Then the frequency comes out of the capacitor and into the transistor, which you use to tune your radio to a station on that frequency.
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