A wave pulse is travelling on a string with a speed \( v \) towards...

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A wave pulse is travelling on a string with a speed \( v \) towards the positive \( X \)-axis. The shape of the string at \( t=0 \) is given by \( g(x)=A \sin (x / a) \), where \( A \) and \( a \) are constants.
(a) What are the dimensions of \( A \) and \( a \) ? (b) Write the equation of the wave for a general time \( t \), if the wave speed is \( v \).
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