The wave function ψ associated with a moving particle is not an observable quantity and does not have any direct physical meaning. It is a complex quantity. The complex wave function can be represented as ψ(*x, y, z, t*) = *a* + i*b* and its complex conjugate as ψ*(*x, y, z, t*) = *a* – i*b*. The product of wave function and its complex conjugate is ψ(*x, y, z, t*)ψ*(*x, y, z, t*) = (*a* + i*b*) (*a* – i*b*) = *a*^{2} + *b*^{2} is a real quantity. However, this can represent the probability density of locating the particle at a place in a given instant of time. The positive square root of ψ(*x, y, z, t*) ψ*(*x, y, z, t*) is represented as |ψ(*x, y, z, t*)|, called the modulus of ψ. The quantity |ψ(*x, y, z, t*)|^{2} is called the probability ...

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