boletin2 - F sica del Estado Slido o Relacin de problemas o...

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ısica del Estado S´olido Relaci´on de problemas Problemas de F´ ısica del Estado S´olido. Bolet´ ın N o 2 1. Considere una red diat´omica linal compuesta por ´ atomos de masa M 1 = 5 , 9 × 10 - 26 kg y M 2 = 3 , 8 × 10 - 26 kg . Suponga que la constate recuperadora en la aproximaci´on arm´onica es K = 5 N / m . Calcule el valor de las frecuencias permitidas en el l´ ımite de la primera zona de Brillouin. 2. Calcule el momento lineal total de un cristal monoat´omico unidimensional de N ´ atomos de masa M en el que hay excitado un fon´on de n´umero de onda κ . 3. Calcule la energ´ ıa de punto cero de un cristal a partir del modelo de Debye. Estime su valor para el He s´olido suponiendo que la temperatura de Debye es de 24 K . 4. Utilizando el modelo de Debye, calcule la frecuencia m´ axima de los modos de vibraci´on de una red c´ubica simple de par´ ametro a = 3 ˚ A en la que la velocidad del sonido es 4 × 10 3 m / s .
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  • Spring '08
  • WORMER
  • Sistema Internacional de Unidades, Cantidad de movimiento, Metro por segundo, Longitud de onda, Estado S´lido

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