Hi there. I am having trouble finding an explanation with waves.
Suppose that you have to sinusoidal waves
y1=Asin(kx-wt) and y2=Asin(kx-wt+phi)
If we add them up, the resulting wave will be y=2Acos(phi/2)sin(kx-wt+phi/2). Now, if phi equals pi then the resulting wave will have no...