Wave Phases? Wtf??? 1. The problem statement, all variables and given/known data 2. Relevant equations None 3. The attempt at a solution I managed to do the first part, but not the second part regarding phases. I don't have a clue how to work the second part out. I know that an anti-node is maximum amplitude and a node is at minimum amplitude. But I don't have a clue how to work out phases, nor do I understand what phase means or why it is used.