Question: Determine the magnitude of the wavefunction (z, t) = A cos [k(z + vt) + ] at the point z = 0, when t =

Determine the magnitude of the wavefunction Ψ(z, t) = A cos [k(z + vt) + π] at the point z = 0, when t = τ/2 and when t = 3π/4.

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