As you know the stadium wave that is more commonly know as "the wave" is one that is transversal. This is because as the wave transfers through the medium which happens to be fans at an athletic event. Since the wave requires people to stand up from their seats and raise their hands quickly the wave's period is measured in a certain way. The way the period is measured is as the time it takes for one complete oscillation which would be a complete wave around the stadium. The frequency is the amount of waves in one second. There is also the amplitude which is how big the wave gets or in this case how many rows high the wave gets or how many rows low the waves gets but the energy is transferred through the amplitude. This is the physics in the wave.