Why are AM broadcast signals propagated by ground waves during the day and by sky waves at night? - Quora
![Difference between AM, FM, signal radio waves types. Amplitude, frequency modulation. High low amplitude pitch note tone voltage volume. Green, red, gray line according waveforms. Colored vector Stock Vector | Adobe Stock Difference between AM, FM, signal radio waves types. Amplitude, frequency modulation. High low amplitude pitch note tone voltage volume. Green, red, gray line according waveforms. Colored vector Stock Vector | Adobe Stock](https://as2.ftcdn.net/v2/jpg/05/50/64/85/1000_F_550648568_r8ZioGloXpPXvjsVNmKukhQ7ZEgPoWnk.jpg)
Difference between AM, FM, signal radio waves types. Amplitude, frequency modulation. High low amplitude pitch note tone voltage volume. Green, red, gray line according waveforms. Colored vector Stock Vector | Adobe Stock
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