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An n-type Ge wafer (ND = 1016/cm3 ) is initially in thermal equilibrium at room temperature. A flash of light at time t = 0

An n-type Ge wafer (ND = 1016/cm3 ) is initially in thermal equilibrium at room temperature. A flash of light at time t = 0 causes the minority carrier concentration to suddenly increase by 50%. When the average minority carrier lifetime is 50 s, find the number of holes per cubic centimeter at time t = 75 s. [20 pts]

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