Calculate the probability current density vector →j for the wave function : ψ=Ae−i(wt−kx).
From my very poor and beginner's understanding of probability density current it is :
d(ψψ∗)dt=iℏ2m[dψdxψ∗−dψ∗dxψ]
By applying the RHS of the above equation :
\frac{i\hbar}{2m}[-A^{2}ikxe^{-i(ωt-kx)}e^{i(ωt-kx)}-A^{2}ikxe^{i(ωt-kx)}e^{-i(ωt-kx)}]
This gives :
\frac{-2iA^{2}ik\hbar}{2m}=\frac{k \hbar A^{2}}{m}
This is not the correct answer. :( What have I done wrong ?
In the model workings instead of A in the complex conjugate of the wave function they have written A^{*}. Why is this necessary since A is likely to be a real number anyways ?
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