Consider the motion of a wire under tension, fixed at both ends. The wire is oscillated to produce standing waves and snapshots of the motion are taken. In the images below, the black bar represents the wire before it is osciallted and the blue line the wire at fixed moments during the oscillation.

Match the following images to the given descriptions, note that there may be repeats, but a standing wave must have nodes at both ends.

You may find it useful to look at this Interactive web animation of standing waves (note: it does require you to install the Wolfram CDF Player, a free download).