# Hi, I know that this is not the books solution and I know what is the result, my question is why I c

Hi, I know that this is not the books solution and I know what is the result, my question is why I can use this procedure or what is it wrong so I can get the given solution by the book if these formulas are allow. Thanks in advance Example 1) Calculate the drift current density in a semiconductor for a given electric field. Consider a germanium sample at T- 300°K with doping concentration of Na-0 and Na -1016 cm3. Assume complete ionization and electron and hole mobilities are 3900 cm2/V-sec and 1900 cm-/V-sec. The applied electric field is E = 50 V/cm. ?? nsic lb3 po Vh3 Sd