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Answers for “为什么我们不能仅用 y = f(x) 来描述波,而必须使用 y = f(x, t)?”

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A rightward-traveling wave is expressed as f(x,t)=f(x−vt,0)f(x,t)=f(x-vt,0) because the wave maintains its shape while shifting horizontally. After time tt, the wave has moved a distance vtvt to the right.

Conditions: The wave propagates in the positive x-direction.; The propagation speed is constant vv.; The waveform remains unchanged during propagation.