3 of 6 Question A4 The diagram below shows the dispersion curve for a one-dimensional chain of identical atoms with harmonic forces between nearest neighbours. 2 M -4 -2 0 2 4 k/ů¹ a) Calculate the unit cell parameter of this chain. b) Estimate the speed of sound in this chain. c) Estimate the harmonic spring constant between nearest neighbours, given that the mass of each atom is m = 2 × 10-26 kg.
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