Physics sound , tension, and waves help?

The speed of the wavefronts are always the same. They depend more on the kind of the medium (depth and viscosity of the liquid and the gas above) than on the speed of the actuator. The scene becomes different the closer the speed of the object grows towards the speed of the wave fronts. With sound, one can hear a condensed group of waves when a supersonic airplane has ped. There I can not give a full description for your question.