Determine the equilibrium recombination constant r for si and gaas, having equilibrium thermal generation rates of 4.03 x 105 (cm3-sec) and 3.18 x 103 (cm2-sec)- x 10 cm3 1.5 x 1010 cm-3 and 2.1 x respectively, and intrinsic carrier concentrations of respectively.

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.