FM radio uses frequency modulation to broadcast sound over radio. FM radio waves are usually transmitted between 87.5 to 108.0 megahertz.
AM waves are reflected by earth's ionosphere
Waves can be varied (modulated) by either changing amplitude (amplitude modulation AM) or changing frequency (wavelength) (frequency modulation FM). The modulations are used to carry the information signal.
Love waves and Rayleigh waves are surface waves
There are no such things as 'AM' and 'FM' waves. When we take an electromagnetic wave, and force it to carry information by changing its amplitude according to some pattern related to the information, we operate on it with the process of 'AM'. Commercial radio stations that add sound information to their carrier waves in that way operate in the frequency band of 0.55 - 1.7 MHz (in the US). When we take an electromagnetic wave, and force it to carry information by changing its frequency according to some pattern related to the information, we operate on it with the process of 'FM'. Commercial radio stations that add sound and other information to their carrier waves in that way operate in the frequency band of 88 - 108 MHz (in the US).
You modulate them (AM, FM, pulse mod, phase mod, etc) same as any other e-m radiation.
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.
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
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.
FM waves are of higher frequency than am waves.AM radio ranges from 535 to 1705 kilohertzFM radio ranges in a higher spectrum from 88 to 108 megahertz.
In FM, which is frequency modulaton, the information is "put onto" the radio waves by varying the frequency of the wave. In AM, which is amplitude modulation, the information is "put onto" the radio waves by varying the amplitude of the wave.
Both are radio waves, meaning that they are electromagnetic radiation (light) with a wavelength longer than a metre. AM waves have a frequency of 520,000 Hz to 1,620,000 Hz (wavelengths of 580 metres to 185 metres) while FM waves have a frequency of 87,500,000 Hz to 108,000,000 Hz (3.4 metres to 2.8 metres). The signal is encoded onto AM waves by varying the amplitude (intensity) and onto FM waves by varying the frequency.
AM Waves diffract more than FM waves.
AM waves are reflected by earth's ionosphere
hearing FM and am news in radio