1. The problem statement, all variables and given/known data Two sinusodial waves, each of wavelength 5m and amplitude 10cm, travel in opposite directions on a 20m streched string which is clamped at each end. Excluding the nodes at the ends , how many nodes appear in the resulting standing wave? 2. Relevant equations 3. The attempt at a solution So I just drew a picture, 20m long string, and drew a wave through it with each wavelength being 5m. I basically disregarded that there were two separate waves. I still got the right answer. Is the fact that they collide irrelevant? Why?