Question

For a transverse wave on a string the string displacement is described by y(x,t) =f(x-at) wheref is a given function and ais a positive constant. Which of the following does NOT necessarily follow from this statement?
A) The shape of the string at time t= 0 is given byf(x).
B) The shape of the waveform does not change as it moves along the string.
C) The waveform moves in the positive xdirection.
D) The speed of the waveform is a.
E) The speed of the waveform is x/t.

Answer

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