1. The problem statement, all variables and given/known data figure is asnapshot.jpg correct & incorrect graphs is aasnapshot.jpg Draw the history graph D(x=0m, t) at x= 0m for the wave shown in the figure. 2. Relevant equations 3. The attempt at a solution I'm not quite understanding the concept of snapshot and history graphs. I think for this one the problem is that is is moving left. The graph that I drew is the wrong one. Here was my reasoning: In the figure, the graph is moving left, so shouldn't the leftmost point on the wave hit the point first? If at t=2 s this leftmost point is 1m away from x=0, then it takes 1 sec for it to arrive, so at t=3. I don't think I am visualizing this at all correctly. Could someone please explain to me why the graph on the bottom is correct? Thanks!