Is state an energy eigenstate of the infinite square well

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SUMMARY

The discussion centers on determining whether the state ψ(x) = aφ1(x) + bφ2(x) + cφ3(x) is an energy eigenstate of the infinite square well. Participants clarify that the potential V(x) is an integral part of the Hamiltonian operator, represented as $$\hat H = \frac{\hat p^2}{2m} + V$$. To find the eigenstates of the Hamiltonian, one must solve the corresponding differential equation. Additionally, it is established that in the infinite square well, the momentum is not always zero, thus H does not equal V.

PREREQUISITES
  • Understanding of quantum mechanics principles, particularly the infinite square well model.
  • Familiarity with Hamiltonian operators and their role in quantum systems.
  • Knowledge of eigenstates and eigenvalues in the context of differential equations.
  • Ability to solve differential equations relevant to quantum mechanics.
NEXT STEPS
  • Study the derivation of eigenstates for the infinite square well using the time-independent Schrödinger equation.
  • Learn about the properties of Hamiltonian operators in quantum mechanics.
  • Explore the concept of eigenvalues and eigenfunctions in quantum systems.
  • Review the implications of boundary conditions in quantum mechanics, specifically for the infinite square well.
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This discussion is beneficial for physics students, particularly those studying quantum mechanics, as well as educators and researchers focusing on quantum systems and their mathematical foundations.

acdurbin953
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Homework Statement


Is state ψ(x) an energy eigenstate of the infinite square well?

ψ(x) = aφ1(x) + bφ2(x) + cφ3(x)

a,b, and c are constants

Homework Equations


Not sure... See attempt at solution.

The Attempt at a Solution


I have no idea how to solve, and my book does not address this type of problem.
My one guess was to let the potential V(x) of the infinite square well be analogous to the Hamiltonian operator, and to then find the eigenstates of V(x). But I don't know how to do that, nor do I know if that is even right.
It would be helpful if someone could point me in the right direction on this one. Thank you.
 
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The potential V is not "analogous" to the hamiltonian - it is part of the hamiltonian.
The hamiltonian operator is: $$\hat H = \frac{\hat p}{2m} + V$$ ... but what are ##\varphi## ?
 
φ is the eigenstate of H, right? How do you calculate the eigenstates of H? Are they solutions of the differential equation that represents H?

Side question: In the case of the infinite well is it correct that H = V because the momentum is always going to be 0?
 

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