Physics 9702 · AS & A Level · Energy levels in atoms and line spectra

Energy levels in atoms and line spectra — practice question

(a)[3]

Explain what the term photon means.

(b)[2]

An emission spectrum appears as a set of differently coloured lines on a black background. Suggest how this observation provides evidence for discrete electron energy levels in atoms.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “transfer of energy in packets/quanta” …

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