This demonstration is specifically based upon the properties of phonons. A diatomic chain with well defined periodicity is used as a linear crystal lattice. As the excitation wave becomes comparable to the length scale of the periodicity of the lattice, the dispersion relation becomes non-linear resulting in band gap between the acoustic and optical branches of the diatomic chain. This is a computer controlled demonstration. A Hall sensor and a magnet is used to observe change in amplitude.

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