Which one of the following does not represent a travelling wave
A$y = \sin (x - v\,t)$
B$y = {y_m}\sin k(x + v\,t)$
C$y = {y_m}\log (x - v\,t)$
D$y = f({x^2} - v\,{t^2})$
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D$y = f({x^2} - v\,{t^2})$
d (d) $y = f({x^2} - v{t^2})$ doesn’t follows the standard wave equation.
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