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That number is the 'frequency' of the radio waves transmitted by that station ...

the number of times the wave wiggles in one second. "102 megahertz" means

102 million every second.

Right now, in your room and in the air around you, there are thousands of radio

signals from AM and FM broadcast stations, police cars, taxis, ambulances, cell

phones, airplanes calling the air-traffic controllers, TV stations on the ground

and TV satellites in space, GPS satellites, and RADARs watching for rainstorms.

The only way your radio is able to pick out the one you want to hear and discard

all the others is to separate them according to their frequencies. If there are

four radio transmitters all close enough to you and all on the same frequency,

then your radio can't separate them, and you hear them all at the same time.

That's why there are never two TV stations in the same city on the same channel,

or two radio stations on the same number.

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Q: What does it mean whe it says that a radio station has 102 megahertz?
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