initial commit / add all books

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diff --git a/1397/CH3/EX3.5/3_5.sce b/1397/CH3/EX3.5/3_5.sce
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+//clc();

+clear;

+//To determine reverberation time of the hall

+V=1000;            //volume of hall in m^3

+A1=400;            //area of wall in m^2

+A2=100;            //area of floor in m^2

+A3=100;            //area of ceiling in m^2

+N=0.02;            //number of cushion chairs of wall 

+a1=0.01;           //absorption coefficient of ceiling

+a2=0.05;           //absorption coefficient of floor

+a3=1.0;            //absorption coefficient of each cushion chair

+T=(0.165*V)/((A1*N)+(A2*a1)+(A2*a2)+(A3*a3))

+printf("reverberation time of the hall is %f sec",T);