PHZ3400 Sound: Difference between revisions
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==Harmonic approximation: inter-atomic forces as springs== | ==Harmonic approximation: inter-atomic forces as springs== | ||
* If we put energy into a crystal the atoms will begin to vibrate. | |||
* We are able to put energy into the crystal in two ways: Mechanical and Thermal. | |||
** Mechanical energy are sound waves | |||
** Thermal energy can be used to measure resistivity. | |||
* Periodicity helps to simplify the problem of lattice vibrations. | |||
==One dimensional mono-atomic chain== | ==One dimensional mono-atomic chain== | ||
Revision as of 15:19, 9 February 2009
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Harmonic approximation: inter-atomic forces as springs
- If we put energy into a crystal the atoms will begin to vibrate.
- We are able to put energy into the crystal in two ways: Mechanical and Thermal.
- Mechanical energy are sound waves
- Thermal energy can be used to measure resistivity.
- Periodicity helps to simplify the problem of lattice vibrations.