IB skill practice

Use quantum model evidence and limitations

Official-syllabus Physics skill catalogue entry. Seeded skills are activated only after exam-style question templates pass validation.

Paper 1, Paper 2 5 marks Difficulty 5

Allowed-state count model

A simplified quantum model in a stellar core model allows \(n^{2}\) states for level \(n\). For \(n=3\), calculate the number of allowed states. Enter the numerical result and choose the interpretation that matches the quantum or nuclear physics.

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