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km707
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We were taught in the vibrations and waves lecture course that the solution to the wave equation for traveling waves is of the form ψ(z,t) = Acos(wt-kz).
In the Electromagnestism course we learned that EM waves are traveling waves and have the solution E = E0cos(kz-wt).
I know that changing the sign of the z term determines the direction of propagation along the z axis, but does that mean that the "-wt" term correspond to moving back in time? Or does the sign of the wt term not matter?
Thanks!
In the Electromagnestism course we learned that EM waves are traveling waves and have the solution E = E0cos(kz-wt).
I know that changing the sign of the z term determines the direction of propagation along the z axis, but does that mean that the "-wt" term correspond to moving back in time? Or does the sign of the wt term not matter?
Thanks!