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University Quantum Mechanics I

University Quantum Mechanics I · The Schrödinger Equation · 2.08

Admissibility and matching conditions on psi

psi is continuous everywhere; psi' is continuous wherever V is finite, jumps at an infinite wall where ψ = 0, and breaks by a set amount at a δ well.

Course-map guide · not a complete lesson or simulation

Scope & orientation

What this subsection covers

psi is continuous everywhere; psi' is continuous wherever V is finite, jumps at an infinite wall where ψ = 0, and breaks by a set amount at a δ well.

A strong response uses rho and j plotted along the same x axis 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 a clamped string's resonances sit at the eigenvalues of the same boundary-value problem that quantises a particle in a box, and where does the analogy fail?

Read the complete note

Do a clamped string's resonances sit at the eigenvalues of the same boundary-value problem that quantises a particle in a box, and where does the analogy fail? Useful evidence includes resonant frequencies against mode number with a linear fit and residuals, end correction and stiffness as systematics, and the disanalogy stated: one kₙ = n π / L feeds two different dispersion relations, so f goes as n here and E as n squared there..

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 claimAdmissibility and matching conditions on psi

psi is continuous everywhere; psi' is continuous wherever V is finite, jumps at an infinite wall where ψ = 0, and breaks by a set amount at a δ well.

Read the complete note

psi is continuous everywhere; psi' is continuous wherever V is finite, jumps at an infinite wall where ψ = 0, and breaks by a set amount at a δ well. The rules come from integrating the equation across the step. A bound state must also be square-integrable - step and plane-wave solutions are not, and are made physical by packets in a later unit.

02 · RepresentationThe subsection's claim

Model, evidence, and boundary

03 · TestPrediction before measurement

What is the strongest test of a claim about Admissibility and matching conditions on psi?

04 · Evidence & boundaryDecide, then qualify

Do a clamped string's resonances sit at the eigenvalues of the same boundary-value problem that quantises a particle in a box, and where does the analogy fail?

Read the complete note

Do a clamped string's resonances sit at the eigenvalues of the same boundary-value problem that quantises a particle in a box, and where does the analogy fail? Useful evidence includes resonant frequencies against mode number with a linear fit and residuals, end correction and stiffness as systematics, and the disanalogy stated: one kₙ = n π / L feeds two different dispersion relations, so f goes as n here and E as n squared there..

Interactive diagram for Admissibility and matching conditions on psi: 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

What is the strongest test of a claim about Admissibility and matching conditions on psi?

Quick check

Test the reasoning, not recall

What is the strongest test of a claim about Admissibility and matching conditions on psi?

Choose an answer to test the model.