What are Radio Waves?
Radio waves are a type of electromagnetic radiation best-known for their use in communication technologies, such as television, mobile phones and radios. These devices receive radio waves and convert them to mechanical vibrations in the speaker to create sound waves.
What is Radio Broadcast?
Radio waves also are omni-directional, meaning that they travel in all directions from the source, so the transmitter and receiver do not have to be carefully aligned physically.
Radio waves are easy to generate, can travel long distances, and can penetrate buildings easily, so they are widely used for communication, both indoors and outdoors.
The properties of radio waves are frequency-dependent.
- At low frequencies, radio waves pass through obstacles well, but the power falls off sharply with distance from the source, roughly as 1/r2 in air.
- At high frequencies, radio waves tend to travel in straight lines and bounce off obstacles. They are also absorbed by rain.
- At all frequencies, radio waves are subject to interference from motors and other electrical equipment.
When you are listening to 97.3 FM, you are actually receiving signals from a radio stations that are being broadcasted at a frequency of 97.3 MHz. It means the transmitter at the station is oscillating at a frequency of 97,300,000 cycles per second. Strange?
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