Question

The eigenfunction of a particle confined in a box of length L (equation) is
equation$
i) Show that equation is not an eigenfunction of the momentum operator.
ii) Calculate the expectation value of the kinetic energy. 

19 Jan 2026
Answer :
Word Count : 222
The eigenfunction of a particle in a one-dimensional box of length (L) is [ \psi_n(x) = \sqrt{\frac{2}{L}} \sin\left(\frac{n \pi x}{L}\right), \quad n = 1,2,3,\dots ] The momentum operator in the (x)-direction is [ \hat{p}_x = -i \hbar \frac{d}{dx}. ] i) Check if (\psi_n(x)) is ______ _________ _______ __________ _____ _________ ____ ____ ______ _____ _______ ____.
________ _______ _____ _______ _____ ______ ________.
____ __________ _____ _____ __________ ________ ____ _________.
________ ____ __________ ____ ___ __________.
_______ ________ _______ _________ ______ _____.
____ ______ __________ ____ ________ ____.
_________ ___ ______ ______ __________ ______ ______ ___ ______ _______.
______ __________ __________ _____ ____ ___ __________ _________ ____ ______ _______.
__________ ____ ____ ___ _______ __________ ________ ___ _________ __________ _______.
_____ ____ ______ __________ ____ ______ ______.
_________ __________ __________ __________ ___ ________ _________ ___ _______ _________ _____ _______.
____ ____ ____ ______ _____ _________ __________ ______ _____ _________.
________ _____ ______ _________ ______ ______ _______.
__________ _________ ________ _________ ____ ________ ______ _____ ____ _____ _________.
__________ ____ _________ ________ ____ ____ _____ ____ ___ ________ ______ _______.
____ ______ ________ ________ ________ __________ _________ ___ ______ ____.
______ ____ ____ _____ ___ ___ _________ _____ _________ _____ ____ _______.
__________ ________ __________ _______ ________ _______.
___ ______ __________ ________ ______ ______ ______ ______.
______ ____ _________ ________ _________ ________.
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