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Can anyone suggest a good source for a computer demo which depicts the
difference between group velocity and phase velocity?
Rather than a computer demo, have you a smooth-surfaced pond somewhere
into which you might drop some rocks? Lacking that, you might just as
well write a factoid on the board as depict the difference. They've
seen utterly unphysical things depicted by computers on TV; why do you
think they will put another depiction into a different class?