For the wavespeed, I\'ve tried take the wavelength (0.2m) and dividing it by the

Question

For the wavespeed, I've tried take the wavelength (0.2m) and dividing it by the time (0.8s - 0s = 0.8s) and that gives me 0.25m/s. The answer says it's 0.15m/s though. Help!

The figure shows a wave moving in the positive x-direction at two instants. From the figure you can see that the point at x = 0.0 cm has a maximum displacement at t = 0. At time t =0.80 s, this point on the wave has moved to x-12.0 cm. What is the wavespeed? Write the equation describing this wave, with all constants evaluated.

Explanation / Answer

a) v =0.12/0.8 = 0.15 m/s

v = L/T

T = L/v = 0.2/0.15 = 1.33s

W = 2*pi/T = 4.71

k = W/v= 31.4

y = A*cos(kx+wt)

y = 3.5*cos(31.4x + 4.71t)

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