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Evaluate the proprgation velcocity of acoustic vibrations in aluminum whose Debye temperature id Theta= 396K. |
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Answer» Solution :We apply the same formula but assume `v_(||) ~~ v_(_|_)`. Then `THETA=( ħ)/(k)v(6pi^(2)n_(0))^(1//3)` or `v=kTheta//[ ħ(6pi^(2)n_(0))^(1//3)]` For Al `n_(0)=(rhoN_(A))/(M)= 6.023xx10^(22) per c.c` Thus `v=3.39km//s.` The TABULATED values are `v_(||)= 6.3km//s` and `v_(_|_)= 3.1km//s` |
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