Question: (a) Using the data presented in Figure, determine the number of free electrons per atom for intrinsic germanium and silicon at room temperature (298 K).

(a) Using the data presented in Figure, determine the number of free electrons per atom for intrinsic germanium and silicon at room temperature (298 K). The densities for Ge and Si are 5.32 and 2.33 g/cm3, respectively.

(b) Now explain the difference in these free-electron-per-atom values. 1028 1026 1024 Ge 1022 Si 1020 1018 1016 1014 1012 1010 108 106 200 400 600 800 1000 1200 1400 1600 1800 T (K) Intrinsic

1028 1026 1024 Ge 1022 Si 1020 1018 1016 1014 1012 1010 108 106 200 400 600 800 1000 1200 1400 1600 1800 T (K) Intrinsic carrier concentration (m3)

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