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University Quantum Mechanics I

University Quantum Mechanics I · Finite Square Wells · 7.05

Even and odd parity solutions of a symmetric well

If V(−x) = V(x) then ψ(−x) solves the same equation at the same energy, and because one-dimensional bound states are non-degenerate, ψ(−x) = ±ψ(x).

Course-map guide · not a complete lesson or simulation

Scope & orientation

What this subsection covers

If V(−x) = V(x) then ψ(−x) solves the same equation at the same energy, and because one-dimensional bound states are non-degenerate, ψ(−x) = ±ψ(x).

A strong response uses well profiles with the bound levels drawn in and states where the model stops being reliable.

Reasoning checklist

Evidence, assumptions and limits

01

Assumptions to state

State the system, observable, approximation, and conditions held fixed before using a model.

02

Evidence to collect

Do graphical roots, a bracketed root-finder, and outward shooting return the same bound-state energies for one well, and where do they part?

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Do graphical roots, a bracketed root-finder, and outward shooting return the same bound-state energies for one well, and where do they part? Useful evidence includes the z0 circle plot with its intersections read off, roots from a bracketed solver, eigenvalues from shooting, the three sets tabulated against the floor(2 z0/π) + 1 prediction, and the tolerance at which the methods disagree..

03

Limits to state

This GioPhysics course map is an adaptable learning sequence, not academic credit, accreditation, or a universal university syllabus.

Read the complete note

This GioPhysics course map is an adaptable learning sequence, not academic credit, accreditation, or a universal university syllabus. It is a first dedicated quantum-mechanics course, distinct from University Physics V, which covers quantum mechanics alongside atomic, nuclear and particle physics in twenty units: this course is narrower, slower, and teaches the linear algebra it needs rather than assuming it. Hydrogen appears here as an introduction, with the full radial derivation belonging to a second course. A midterm examination is assumed around week 8. Follow your institution's published scope, notation, laboratory programme, and assessment rules. A result should be checked against units, signs, limiting cases, and the conditions under which its model was derived.

Diagram & examples

Work the claim before choosing an equation

Interactive concept map

Follow the model from claim to evidence.

01 · Physical claimEven and odd parity solutions of a symmetric well

If V(−x) = V(x) then ψ(−x) solves the same equation at the same energy, and because one-dimensional bound states are non-degenerate, ψ(−x) = ±ψ(x).

Read the complete note

If V(−x) = V(x) then ψ(−x) solves the same equation at the same energy, and because one-dimensional bound states are non-degenerate, ψ(−x) = ±ψ(x). The interior is therefore a pure cosine or a pure sine, and matching at a single wall settles it. An asymmetric well destroys the saving.

02 · RepresentationThe subsection's claim

Model, evidence, and boundary

03 · TestPrediction before measurement

Which response about Even and odd parity solutions of a symmetric well is most defensible?

04 · Evidence & boundaryDecide, then qualify

Do graphical roots, a bracketed root-finder, and outward shooting return the same bound-state energies for one well, and where do they part?

Read the complete note

Do graphical roots, a bracketed root-finder, and outward shooting return the same bound-state energies for one well, and where do they part? Useful evidence includes the z0 circle plot with its intersections read off, roots from a bracketed solver, eigenvalues from shooting, the three sets tabulated against the floor(2 z0/π) + 1 prediction, and the tolerance at which the methods disagree..

Interactive diagram for Even and odd parity solutions of a symmetric well: follow the physical claim through its representation, proposed test, evidence, and model boundary.

modelModel, evidence, and boundary turns the stated idea into a representation that can make a prediction.

Example questions

Try the reasoning before revealing the structure.

Diagram check

Which response about Even and odd parity solutions of a symmetric well is most defensible?

Quick check

Test the reasoning, not recall

Which response about Even and odd parity solutions of a symmetric well is most defensible?

Choose an answer to test the model.