A sinusoidal wave of frequency 500 Hz has a speed of 350 m/s. (a) How far apart are two points that differ in phase by Pi/3 rad? I was thinking that I need to use the equation y= Asin(kx-wt+pi/3) I found the wavelength=0.70m used this to find k=8.98 solved for w by converting the frequency to the period and using w=2pi/T to get w=3141 but I don't have amplitude. I figured after plugging everything in and solving for x gives me the distnace apart. Is this the right approach?