The relationship between the amplitude and energy of a wave can be explained as energy being directly proportional to amplitude squared. Frequency is inversely proportional to the wave's amplitude. Thus, energy is inversely proportional to frequency squared.
The transfer of energy from one place to another without transporting matter is referred to as a wave. There are two key groups of waves, non-mechanical and mechanical. Mechanical waves need a medium like water and sound for energy transfer. Non-mechanical waves like electromagnetic waves do not need any medium for energy transfer. They can travel through vacuum. Electromagnetic waves include radio, microwave, television, ultraviolet and visible light, which is comprised of green, indigo, orange, red, blue, yellow and violet.