Estimate the mean free path of phonons in germanium at a temperature of 300 K, using the following data: Debye temperature of germanium Q = 360 K, thermal conductivity coefficient c = 80 W/(m•K), atomic weight equal to 72.6, density p = 5500 kg/ m3, average speed of sound s = 4500 m/s. Assume that heat transfer is carried out only by phonons.

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