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

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Electrons orbit in specific fixed orbits, they are not allowed to orbit in the spaces between. Each of these orbits has an energy
level associated with it.

The GROUND STATE is the lowest energy level
An electron which moves from its USUAL ENERGY level to a HIGHER ENERGY LEVEL…

Page 2

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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…

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…

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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…


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