(a) In tin at room temperature, the mobility of mobile electrons is about 1.5 ✕ 10-3 (m/s)/(V/m), and there are about 3.7 ✕ 1028 mobile electrons per m3. Calculate the conductivity σ. In actual practice, it is usually easier to measure the conductivity σ and deduce the mobility u from this measurement.

The value is

Explanation:

From the question we are told that

   The mobility of electron in a tiny room is  

  The number of mobile electron per is  

  Generally the conductivity is mathematically represented as

Here   is the charge on a single electron and that value is  

So

=>      

=>    

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