Wave equation : impedance and velocities

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[@sakshamsahdev3468]

sir I caught you . but you were really clever at 14:20 and didn't even added pi/2 …. I think you got sir

[@functions1799]

at 15:19 in the first equation how did a extra i came in RHS PART

[@the_colors_]

It comes there when you differentiate y with respect to x, beacuse there is an iota in the exponential. So when you put the value of dy/dx back in the force equation, it will be there.