The equation of a wave travelling on a string stretched along the \...

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The equation of a wave travelling on a string stretched along the \( X \)-axis is given by
\( \mathrm{P} \)
\[
y=A e^{-\left(\frac{x}{a}+\frac{t}{T}\right)^{2}} .
\]
W
(a) Write the dimensions of \( A, a \) and \( T \). (b) Find the wave speed. (c) In which direction is the wave travelling ? (d) Where is the maximum of the pulse located at \( t=T \) ? At \( t=2 T \) ?
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