# Energy & Momentum of a Wavefunction and their Probabilities

The wave function of a particle of mass m that moves in a region of uniform potential V_0 is

psi(x) = A(cos kx + cos 2kx),

where A and k are constants. Momentum is measured; what are the possible outcomes and their probabilities? Starting with the same initial wave function psi(x) a measurement of the energy is made; what are the possible outcomes and their probabilities?

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