University Physics III · Quantum Physics · 9.04
Matter waves and electron diffraction
De Broglie wavelength h over p, the accelerated-electron form h over the square root of 2meV, Davisson-Germer and neutron crystal-spacing conditions, and electron-microscope resolution; wave behaviour becomes measurable only once lambda is comparable to the diffracting spacing, and the non-relativistic form overstates lambda by about five percent at 100 kV.
Course-map guide · not a complete lesson or simulationScope & orientation
What this subsection covers
De Broglie wavelength h over p, the accelerated-electron form h over the square root of 2meV, Davisson-Germer and neutron crystal-spacing conditions, and electron-microscope resolution; wave behaviour becomes measurable only once lambda is comparable to the diffracting spacing, and the non-relativi…A strong response uses energy-scale and wavelength comparison tables and states where the model stops being reliable.
Reasoning checklist
Evidence, assumptions and limits
Assumptions to state
State the system, observable, approximation, and conditions held fixed before using a model.
Evidence to collect
Which bound-state energies does a numerical solution give for a finite well, and how do they approach the infinite-well limit?
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Which bound-state energies does a numerical solution give for a finite well, and how do they approach the infinite-well limit? Useful evidence includes discretized wavefunctions, eigenvalues versus grid spacing, normalization and node checks, penetration depths, and comparison with the analytic infinite-well spectrum.
Limits to state
This GioPhysics course map is an adaptable learning sequence, not academic credit, accreditation, or a universal university syllabus.
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This GioPhysics course map is an adaptable learning sequence, not academic credit, accreditation, or a universal university syllabus. Third-semester content is the least standardised of the introductory sequence: departments place oscillations, waves, optics, and thermal physics differently, and the modern-physics units here are a bounded survey rather than a complete course in relativity, quantum mechanics, atomic, nuclear, or particle physics. 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.
Model, evidence, and boundary
What must be stated before selecting an equation for Matter waves and electron diffraction?
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.
What must be stated before selecting an equation for Matter waves and electron diffraction?
Quick check
Test the reasoning, not recall
What must be stated before selecting an equation for Matter waves and electron diffraction?
Choose an answer to test the model.