### Calculate the drift velocity of electrons

Assignment Help Mechanical Engineering
##### Reference no: EM13948067

1. Briefly tell what is meant by the drift velocity and mobility of a free electron.

2. (a) Calculate the drift velocity of electrons in silicon at room temperature and when the magnitude of the electric field is 500 V/m.

(b) Under these circumstances, how long does it take an electron to traverse a 25-mm (1-in.) length of crystal?

3. At room temperature the electrical conduc- tivity and the electron mobility for aluminum are 3.8 X 107  (D-m)-1 and 0.0012 m2/V-s, re- spectively.

(a) Compute the number of free electrons  per  cubic  meter  for  aluminum  at room temperature.

(b) What is the number of free electrons per aluminum atom? Assume a density of 2.7 g/cm3.

4. (a)  Calculate  the  number  of  free  electrons per  cubic  meter  for  silver,  assuming  that there are 1.3 free electrons per silver atom. The  electrical  conductivity  and  density  for Ag are 6.8 X 107  (D-m)-1 and 10.5 g/cm3, re- spectively.

(b)  Now  compute  the  electron mobility for Ag.

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