50.48. Devil´s, Vorobyyov

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50.48. To find the relation of average length of free run of phonons to lattice parameter d at the room temperature in NaCl crystal if heat conductivity of  at the same temperature is equal 71vt / (m • К). To calculate a thermal capacity under Neumann-Kopp´s law. Relative atomic masses: ANa=23, ACl=35,5; density of  of a crystal is equal 2, l7 • To ³¬ú/m ³. To accept the average speed of  of a sound equal 5km/page.

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