A human wave, during sporting events within large, densely packed stadiums, spectators will send a wave (or pulse) around the stadium (Figure). As the wave reaches a group of spectators, they stand with a cheer and then sit. At any instant, the width w of the wave is the distance from the leading edge (people are just about to stand) to the trailing edge (people have just sat down). Suppose a human wave travels a distance of 853 seats around a stadium rn 39 s, with spectators requiring about 1.8 s to respond to the wave's passage by standing and then sitting. What are?(a) The wave speed v (in seats per second) and(b) Width w (in number ofseats)?

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