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A n-type silicon sample of width 4xx10^(...

A n-type silicon sample of width `4xx10^(-3)m`, thickness `25xx10^(-5)m` and length `6xx10^(-2)m` carries a current of 4.8 mA when the voltage is applied across the length of the sample. If the free electron density is `10^(22)m^(-3)`, then find how much time does it take for the electrons to travel the full length of the sample? Given that charge on an electron `e=1.6xx10^(-19)C`

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`4800 A//m^(2)`,0.02s
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