WAVES AND OSCILLATIONS - WAVE MOTION - PHASE AND GROUP VELOCITY	NC State University Faculty Access
Previous Next Group Velocity Transparencies # 3B33.20
Description: Two transparencies with closely-spaced parallel lines, are slowly slid across each other. One has a spacing ten percent smaller than the other, so the difference in spacing creates a moire interference pattern. Wave groups move rapidly across the picture while the wave velocity is much smaller. Wave velocity, seen as the motion of the transparency, can be seen by a marks on the transparencies. Transparency 1 and Transparency 2 can be downloaded for printing. Purchased/Built: built Quant. in Demo Room: 1 Demo References Meiners 18-8.9 Move two combs across each other on an overhead projector to demonstrate phase and group velocity. Picture. The American Journal of Physics AJP 38(4),547 This was published in AJP,21,388 (1953). The American Journal of Physics AJP 37(8),842 Superimpose two combs on the overhead projector to show phase and group velocity.
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