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CAIE A-Level Physics 22.4.2 Emission and Absorption Line Spectra

Practise explaining emission and absorption spectra as transitions between discrete atomic energy levels and interpreting their spectral lines.

Syllabus
2028–2030
Course
Physics 9702
Level
A2

Exam points

  • explain the appearance and formation of emission and absorption line spectra
  • relate spectral lines to transitions between discrete atomic energy levels

22.4.2—The appearance and formation of emission and absorption line spectra question 1

[Maximum number: 4]

A beam of light consists of a continuous range of wavelengths from 420 nm to 740 nm . The light passes through a cloud of cool gas, as shown in Fig. 11.1.

Fig. 11.1

Fig. 11.1

The spectrum of the light emerging from the cloud of cool gas is viewed using a diffraction grating.
Explain why this spectrum contains a number of dark lines.

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