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Cambridge AS & A Level Physics

22.4Energy levels in atoms and line spectra

Energy levels in atoms and line spectra in Cambridge AS & A Level Physics: what the syllabus expects you to know, the learning objectives and how to practise.
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Learning objectives

What the syllabus expects you to be able to do.

  1. 22.4.1Recognise discrete electron energy levels in isolated atoms.
  2. 22.4.2Explain the appearance and formation of emission and absorption line spectra.
  3. 22.4.3Recall and use hf = E₁ − E₂.

Lessons

  • Energy levels and line spectra

    45 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Energy levels in atoms and line spectra: sample question

1 mark

An electron falls from a level of −1.6 eV to a level of −5.5 eV. What is the energy of the emitted photon?

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