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Wave in Negative X-Direction

Which of the ...

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Which of the following functions for y can never represent a travelling wave? (a) (x^2-vt)^2 (b) log [x+vt/x0] (c) e{- (x+vt/x0}^2 (d) 1/x=vt options (1) Only a (2) b and c (3) c and d (4)only c

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Wave in Negative X-Direction

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