University Physics III · Nuclear and Particle Physics · 11.04
Q values, two-body kinematics, and conservation ledgers
Q from tabulated masses, the momentum-fixed energy split between two fragments of a parent at rest, lab-frame thresholds for endothermic reactions, and the charge, nucleon-number, and lepton-number ledgers that forbid reactions without predicting any rate.
Course-map guide · not a complete lesson or simulationScope & orientation
What this subsection covers
Q from tabulated masses, the momentum-fixed energy split between two fragments of a parent at rest, lab-frame thresholds for endothermic reactions, and the charge, nucleon-number, and lepton-number ledgers that forbid reactions without predicting any rate.A strong response uses feynman-style interaction sketches 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
Does binding energy per nucleon computed from tabulated atomic masses locate the maximum of the curve and predict which reactions release energy?
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Does binding energy per nucleon computed from tabulated atomic masses locate the maximum of the curve and predict which reactions release energy? Useful evidence includes computed B/A across the nuclide chart, the nuclide that actually maximises it, Q values for one fission and one fusion reaction, and comparison with published energy releases.
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.
Q from tabulated masses, the momentum-fixed energy split between two fragments of a parent at rest, lab-frame thresholds for endothermic reactions, and the charge, nucleon-number, and lepton-number ledgers that forbid reactions without predicting any rate.
Model, evidence, and boundary
What is the strongest test of a claim about Q values, two-body kinematics, and conservation ledgers?
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 is the strongest test of a claim about Q values, two-body kinematics, and conservation ledgers?
Quick check
Test the reasoning, not recall
What is the strongest test of a claim about Q values, two-body kinematics, and conservation ledgers?
Choose an answer to test the model.