conductivity at 298 K was 5.92*10^7 S/m. The wire was cooled to 4K and its conductivity was measured at 4K. It was 2000x higher than at room temperature (conductivity = 1.18*10^11 S/m). Assuming that only dislocations contribute to the scattering, calculate density of dislocations, C_D, stored in the wire at: a) specific scattering of dislocation line is 1*10^-25 Ohm*m^3. b) the phonon contribution to the resistivity at 298K is 1.5*10^-6 Ohm*cm. c) the phonon contribution to the resistivity at 78K is 1.5*10^-7 Ohm*cm. d) the phonon contribution to the resistivity at 4K is 1.5*10^-12 Ohm*cm.

conductivity at 298 K was 5.9210^7 S/m. The wire was cooled to 4K and its conductivity was measured at 4K. It was 2000x higher than at room temperature (conductivity = 1.1810^11 S/m). Assuming that only dislocations contribute to the scattering, calculate density of dislocations, C_D, stored in the wire at: a) specific scattering of dislocation line is 110^-25 Ohmm^3. b) the phonon contribution to the resistivity at 298K is 1.510^-6 Ohmcm. c) the phonon contribution to the resistivity at 78K is 1.510^-7 Ohmcm. d) the phonon contribution to the resistivity at 4K is 1.510^-12 Ohmcm.