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How can I write the wave function of a particle in an infinite box (in the state n) as a superposition of the eigenstates of the momentum operator?

the wave function is:

PHIn(x,t) = sqrt(2/a) * Sin(n * PI/a * x) * exp(-i En/h * t)

Thanks for your help!

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# Homework Help: Wave Function as superposition of eigenstates

**Physics Forums | Science Articles, Homework Help, Discussion**