Waves FM was created in 1990.
Radio waves
AM and FM are modulation types, that can probably be used for different kind of waves; but they are usually applied to radio waves. Radio waves are a kind of electromagnetic waves.
WILL-FM was created in 1941.
Picture is AM, sound is AM or FM
FM radio has the higher frequency which is why it sounds better. AM is a lower frequency but can travel further because the waves bounce off
FM waves, or frequency modulation waves, are a type of electromagnetic wave used in radio broadcasting. They carry audio information by varying the frequency of the wave, resulting in clearer sound quality and less susceptibility to interference compared to AM waves. FM radio stations are assigned specific frequencies to prevent signal overlap.
Generally, the wavelength of an FM signal is shorter than an AM signal. A typical FM broadcast band is 88-108 MHz, while a typical AM broadcast band is 540-1660 KHz, making the FM signal wavelength 100 times shorter.
There is no fundamental difference in the waves. It so happens that in the USA, commercial AM radio broadcasts in a frequency band around 1 MHz, and FM radio broadcasts in a band around 100 MHz, so their frequencies and wavelengths are different. But that has nothing to do with being AM or FM waves. The codes used to manipulate the waves in order to make them carry information are different for AM and FM, but there's no physical difference in the waves themselves.
CILU-FM was created in 2005.
WFRN-FM was created in 1979.
DWEL-FM was created in 1995.
WTTX-FM was created in 1976.