Let y = `1/(1 + x^2)` at t = 0 be the amplitude of the wave propagating in the positive x-direction. At t = 2s, the amplitude of the wave propagating becomes y = `1/(1 + (x - 2)^2)`. Assume that the shape of the wave does not
change during propagation. The velocity of the wave is:
Concept: Standing Waves
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