Phase Difference - Waves! Help! URGENT 1. The problem statement, all variables and given/known data Firstly, can I add that this question is second part of a question , the first part asked me to find the amplitude and wavelength of a wave from a picture, I got these to be a) Amplitude = 8mm - b) Wavelength = 47mm <<<<These two are 100% correct values, I checked the answers at the back of the book. So, the question I'm stuck on is "For the waves in figure 4: - determine the phase difference between P and R." I've measured this and the distance between the two is 100% 24.5mm. From this I use the equation: the phase difference in radians = 2 x Pi x d/[tex]\lambda[/tex] 2. Relevant equations the phase difference in radians = 2 x Pi x d/[tex]\lambda[/tex] 3. The attempt at a solution From the phase difference in radians = 2 x Pi x d/[tex]\lambda[/tex] I do, 2 x Pi x 0.0245/0.047 = 3.2757... This gives my answer in rads, but, from here one, do you convert it too degrees, secondly is this correct. The correct answer at the back of the book is 180degrees.