(a) White light passes through a cloud of cool low-pressure gas, as illustrated in Fig. 10.1.
[Figure 10.1]
For light that has passed through the gas, its continuous spectrum is seen to contain a number of darker lines.
Use the concept of discrete electron energy levels to explain the existence of these darker lines.

Q: What topic does this question test?

This question tests Quantum physics in A-Level Physics (syllabus code 9702). It is worth 9 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics May/June 2020 examination, Paper 4 Variant 1 (9702_s20_qp_41.pdf).

Question

(a) White light passes through a cloud of cool low-pressure gas, as illustrated in Fig. 10.1.
[Figure 10.1]
For light that has passed through the gas, its continuous spectrum is seen to contain a number of darker lines.
Use the concept of discrete electron energy levels to explain the existence of these darker lines.

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