EM spectrum: radio wave, infrared, visible light, ultraviolet, X and Gamma ray

Today, my topic is electromagnetic (EM) spectrum, and their uses.
At any single moment, we are surrounded with all kinds of electromagnetic waves: such as
waves transmitted by radio and TV stations; waves generated from Wi-Fi equipment, computers, phones, microwave ovens, and waves from fire, radiator, and the Sun. Luckily we can only see some of them, such as, visible light, not everything, otherwise, we would become so dizzy and lightheaded that we cannot focus doing anything.
EM waves can be classified and arranged according to their different frequencies; this classification is called the EM spectrum.
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Playlist: Wireless and Wi-Fi

https://www.youtube.com/watch?v=WOTeFceIeM8&list=PLSNNzog5eydvJG48PYnWnNY7-tQIfxTRb&index=1
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Sunny Classroom

Видео EM spectrum: radio wave, infrared, visible light, ultraviolet, X and Gamma ray канала Sunny Classroom