For a free particle stationary state, one would expect the expectation values are constants, for example, <x> (t) = 0. From its one dimensional wave function psi(x,t)= exp(ipx/h-iEt/h)/L^1/2, <x> is undefinied (or zero since x has odd parity).(adsbygoogle = window.adsbygoogle || []).push({});

How does one reconcile the above with Ehrenfest's theorem which states that <x> is a fucntion of time:

<x>(t) = <x>(0) + pt/m?

Thanks in advance for your help!

rays

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# A free particle paradox?

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