(4-2) Now let’s work out an equation for this travelling wave. Let’s say it has amplitude A and wavelength λ. For now, we’ll also stipulate, to keep it simple, that at t=0, it starts out as a simple sine curve, y = sin(x): this means that when t=0, y=0.
① If the wave’s velocity (ie the speed at which each peak is moving to the right) is v, how far will a peak have moved to the right after time t ?
② Now build this into your general equation from (4-1). (Think particularly about the relationship to what happened in curve (d) in that question).