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Why is the equation of a wave moving in the positive x-axis of the form f(x-vt) and not f(x+vt)?

Why is the equation of a wave moving in the positive x-axis of the form f(x-vt) and not f(x+vt)?

Grade:11

1 Answers

Chetan Mandayam Nayakar
312 Points
9 years ago

for f(x-vt), x-vt is constant, d(x-vt)/dt=0,dx/dt=v,which is positive. For f(x+vt), it will be negative.

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