Ok, i'm confused. Wavelength and frequency is basically the same thing, just different measures. Hight energy photon means that it has high frequency/ low wavelength. There are AM - amplitude modulators and FM - frequency modulators. (radio) Radio waves are photons, just really long ones. I don't get it: changing amplitude literally means how much energy you put in the wave, but changing frequency - the same. (??) When a photon is emitted in, for example, annihilation of electron and positron it is very energetic - high frequency photon is emitted (gamma ray). Whats the deal with amplitude? Can someone bring some clarity to this?