Hi all, This is not homework or coursework. I am not sure whether this question would be classed as homework or coursework because it is neither. I am using the AQA Physics A AS text book and attempting exercise 12.2 on page 177. In I am stuck on question 4 and I have absolutely no idea on how to find the amplitude. I have spent almost a day but still I haven't been able to find a matching answer. I was hoping someone here might help me. Here is the full question: For the waves in Figure 4, a) determine i the amplitude and wavelength, ii the phase difference between P and R, iii the phase difference between P and S. I can find the phase differences but not the wavelength and amplitude. I am probably missing something or have missed something and I am looking for a hint. I managed to find a preview of the page here I managed to get a screenshot of the page: Thank you.