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1. If the current density passing through the n-type 1 ohm-cm Si bar is increased to 10₄ A/cm² and 10⁵ A/cm² (by reducing the cross-sectional area, what are the drift times for an electron across a 1 mm long Si bar?

2. The mobility of electrons in a certain n-type Si is about 1000cm²V-s. What is the scattering mean-free-time of the electrons/ (m_n=m).

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