IB Physics SL E 1 3 Atomic Energy Levels Questions
Use SL atomic spectra to explain discrete energy levels, photon emission and absorption, and why spectral evidence changed the atomic model.
- Syllabus
- First assessment 2025
- Course
- Physics SL
- Level
- SL
Exam points
- explain that discrete atomic energy levels produce line spectra when electrons move between allowed levels
- relate an electron transition to photon frequency, wavelength and energy using the energy difference and E=hf or E=hc/λ
- interpret emission or absorption spectra as evidence for quantized atomic energy levels and the limits of earlier atomic models
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IB Physics SL E 1 3 Atomic Energy Levels Questions question 1
[Maximum number: 7]
This question is about atomic energy levels.
Question (a)
(a)
Outline a laboratory procedure for producing and observing the atomic absorption spectrum of a gas.
[ 3 ]
shine white light through;
a tube of the gas;
then observe with spectroscope/grating/prism;
Question (b)
(b)
Describe the appearance of an atomic absorption spectrum.
[ 1 ]
continuous spectrum crossed by dark lines;
Question (c)
(c)
Explain why the spectrum in (a) provides evidence for quantization of energy in atoms.
[ 3 ]
dark lines formed by the absorption of photons;
the absorbed photons have specific/discreet wavelengths;
indicating discreet differences in energy;
which can only be explained by existence of energy levels;
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