There is one thing that’s bugging me. I read about electromagnetic spectrum. It says that light is, by its nature, electromagnetic wave just like radio signals, microwaves, X and gamma rays, infrared waves etc. The only difference between these waves is their frequency, right? Now imagine this: I have a radio transmitter and I am increasing its frequency. Does this mean that the antenna of my transmitter will begin to emit visible light when the frequency of my signal enters the frequency range of the visible light?