Energy levels in atoms and line spectra: past paper questions

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• Question 8Oct/Nov 2025, paper 42Structured10 marksHas a diagram

  Fig. 8.1 shows the three lowest-frequency lines in the part of the emission spectrum for hydrogen that relates to electron transitions to the ground state (level $n=1$).

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• Question 8May/June 2024, paper 42Structured12 marksHas a diagram

  Fig. 8.1 shows part of the emission spectrum of visible radiation emitted by hydrogen gas in a star in a distant galaxy. The galaxy is moving away from the Earth at a speed of $6.2\times {10}^6{\text{ m s}}^{-1}$.

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• Question 8May/June 2023, paper 42Structured8 marksHas a diagram

  Fig. 8.1 shows the lowest four energy levels of an electron in an isolated atom. Fig. 8.2 shows the lines in the emission spectrum of the atom that correspond to the transitions of the electron from $n=3$ to $n=1$ and from $n=4$ to $n=1$.

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