I just read the section in my physics book that deals with the energy transported by a wave and I have a couple of questions: A wave travels through a medium and given the right conditions, the medium will move in SHM. 1) Is the energy transported by a wave the energy of a single point particle of the medium moving in SHM or is it the energy of the whole system (say, a rope, the area of rippling water or the volume of vibrating air)? 2) Say I move a piece of rope up and down twice such that two traveling crests are produced on the rope. I would imagine that the energy of the wave is proportional to the two crests somehow. If I were to move the rope to create more moving crests, I would have added more energy to the traveling wave right?