Question

A pulse is travelling on string is described by $y=\frac{8}{(7x+24t{)}^2+16}$. What is the velocity of pulse?

• A. $v=-\frac{24}{7}m/s$
• B. $v=\frac{24}{7}m/s$
• C. $v=5m/s$
• D. $v=\frac{8}{16}m/s$

Answer 1

The correct option is A $v=-\frac{24}{7}m/s$

General equation of a travelling wave is given by:
$y=f(x-vt)$,

If we compare above equation with the given equation for $y$, we can say:
$y=\frac{8}{49[x-(\frac{-24}{7})t{]}^2+16}⟹v=-\frac{24}{7}m/s$