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tigigi
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Could anyone gives me some hints of how to solve these problems ?
1. a sample of Ge has both electrons and holes carrying the current. When a hall measurement is done, there's no hall effect. If the mobility of electrons in Germanium is 3500 cm^2/V.s and that of holes is 1500 cm^2/V.s, show that 30% of the current is carried the electrons.
2. a well lagged wire (no heat enters or leaves except at the ends) length L and cross sectional area A has its ends maintained at T1 and T2. The thermal conductivity of the wire K=B+CT where B and C are constants. Show that the rate of flow of heat along the wire is given by dQ/dt = A/L(T1-T2) {B+C/2 (T1+T2)}
Thank you. I appreciate it.
1. a sample of Ge has both electrons and holes carrying the current. When a hall measurement is done, there's no hall effect. If the mobility of electrons in Germanium is 3500 cm^2/V.s and that of holes is 1500 cm^2/V.s, show that 30% of the current is carried the electrons.
2. a well lagged wire (no heat enters or leaves except at the ends) length L and cross sectional area A has its ends maintained at T1 and T2. The thermal conductivity of the wire K=B+CT where B and C are constants. Show that the rate of flow of heat along the wire is given by dQ/dt = A/L(T1-T2) {B+C/2 (T1+T2)}
Thank you. I appreciate it.