initial commit / add all books

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+//pagenumber 26 example 3

+clear

+ni=2.5*10^13;//per square centimetre

+moe=3800//square centimetre/velocity second

+mo1=1800;//square centimetre/velocity second

+num=4.51*10^22;//number of atoms

+q=1.6*10^-19;

+conduc=ni*q*(moe+mo1);

+num=num/10^7;

+impura=(ni^2)/num;

+ni=5*10^14;

+condu1=ni*q*moe;

+disp("conductivity   =   "+string((conduc))+"second per centimetre");

+disp("conductivity at extent of 1 impurity   =   "+string((condu1))+"second per centimetre");//there is mistake in book as 3.04s/cm

+conduc=num*q*mo1;

+disp("conductivity  acceptor to extent of 1 impurity   =   "+string((conduc))+"second per centimetre");

+

+

+