A pulse traveling along a string of linear

A pulse traveling along a string of linear mass density μ is described by the wave function
y = [A0e─bx] sin (kx ─ wt)
Where the factor in brackets before the sine function is said to be the amplitude
(a) What is the power P (x) carried by this wave at a point x?
(b) What is the power carried by this wave at the origin?
(c) Compute the ratio P(x)/P (0).

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