Higher Physics - Unit 3 - Electrons, Absorption and Emission

I created my own revision notes for all units of the Higher Physics course.

These are revision notes for part of the 3rd unit (Radiation and Matter), section 3 (Optoelectronics and Semi-conductors). I've uploaded all the subsections of this section in different files as they are otherwise too large.

Electrons, Absorption and Emission covers:
• Electron orbits
• Electron states/levels
• Photon absorption/emission
• Line emission spectra
• Line absorption spectra
• Associated equations

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  • Created by: Visser
  • Created on: 08-05-10 16:33
Preview of Higher Physics - Unit 3 - Electrons, Absorption and Emission

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The electron drops back down to its original energy level and releases a quantum of energy or a photon.
As the energy levels have different values, each of the possible electron transitions within an atom will produce a photon
with a different energy. This means that each electron transition will produce a photon of different frequency and hence a
different colour.
This causes line emission spectra to be produced.…read more

Page 3

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Sodium flames absorbs photons to fill energy gaps
Emits photons in all directions
Black lines appear where the colours of these particular energies would have been
Before the sodium flame is lit, the white light source produces a full spectrum of photons resulting in a complete colour
spectrum being visible at the telescope. Once the sodium flame is lit, black lines or `missing colours' appear in the spectrum.…read more

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The spectrum of light produced by the sun shows a number of dark lines.
These lines are due to the absorption of certain frequencies of light by gases in the outer atmosphere of the sun.
Thus it is possible to analyse the composition of the sun's atmosphere by studying these absorption spectra.…read more


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