It affects our lives every day. So, have you ever wondered to yourself,. The simplest answer may be that a radio is a device that either makes, or responds to, radio waves. You may have already learned that radio waves are part of the larger group of the electromagnetic waves , the group which also includes light, x-rays, even gamma rays.
These waves can travel through materials, like air or wood or glass or concrete, or even through the empty vacuum of space. In fact, they travel best though empty space. Some of the waves, such as light, x-rays, and gamma rays can pass reasonably well through varying amount of water or metal.
If all a radio did was just to make or respond to radio waves it would be a very fascinating scientific curiosity, but maybe only little more than that. It is the ability of radio to permit communications that makes it so vital to out modern society. Try to make a list of as many different ways you can think of for one person to communicate with another person.
How many of those ways require the two people to be close to one another? For which kinds of communication may the persons be far apart? Which one happen right away, and which may take hours or even days or weeks?
Which ones have to have a wire connecting the places where the people are? See the full definition for radio in the English Language Learners Dictionary. English Language Learners Definition of radio Entry 3 of 2. Nglish: Translation of radio for Spanish Speakers. Britannica English: Translation of radio for Arabic Speakers. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Log in Sign Up. Save Word. Definition of radio Entry 1 of 4. Definition of radio Entry 2 of 4. Definition of radio Entry 3 of 4. Definition of radio- Entry 4 of 4. Examples of radio in a Sentence Noun The news was sent by radio. I listen to the radio all the time. I heard the news on the radio. There's a problem with the car's radio. The radio was playing very loudly. The pilot's radio wasn't working. Verb The police radioed for backup.
The stranded sailors were radioing for help. A transmitter radiates this field outward via an antenna; a receiver then picks up the field and translates it to the sounds heard through the radio. In AM Amplitude Modulation radio, the strength amplitude of the signal is changed modulated to make the sounds. In FM Frequency Modulation radio, it is the speed frequency of the signal that is changed. When you tune in your radio, the dial number indicates the kilo or megaHertz at which the signal is being broadcast.
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