# Displacement of a point on a progressive wave

1. May 30, 2015

### jack edison

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
I wrote that Y will have a negative displacement, before returning to equilibrium. Why is Y's displacement positive instead?

2. May 30, 2015

### theodoros.mihos

This wave travelling to "+" or right direction so the wave function is: $\Psi(x,k) = A\sin(\omega{t} - kx)$.
Simpler, imagine the wave curve travelling to the right.