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A particle confined in a region of length L has a wave function
being a superposition of two counter-propagating de-Broglie waves:
(x) = C(ekz + ue¬ikz).
Here a = a1+ia2 = ao exp(ip) is a complex constant, where ao = Vaf + a
and tan y = a2/a1.
Calculate:
1. The normalization constant C.
2. The probability density to find a particle at the position r.
3. The probability current density J(r) as a function of k, ao and p.

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