initial commit / add all books

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diff --git a/3875/CH11/EX11.21/Ex11_21.sce b/3875/CH11/EX11.21/Ex11_21.sce
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+clc;

+clear;

+lambda=0.171 //wavelength of X-ray in nm

+tetha_1=30 //Braggs angle in degree

+tetha_2_degrees=35 //part of Braggs angle in degrees

+tetha_2_minutes=17 //part of Braggs angle in minutes

+h=1 //x intercept of the parallel plane 

+k=1 //y intercept of the parallel plane 

+l=0 //z intercept of the parallel plane 

+

+//calculation

+//case(A)

+d_110=lambda/(2*sind(tetha_1))

+a=d_110*sqrt(h^2+k^2+l^2)

+mprintf("The lattice parameter is = %1.3f nm\n",a)

+

+//case(B)

+h=2 //x intercept of the parallel plane 

+k=0 //y intercept of the parallel plane 

+l=0 //z intercept of the parallel plane 

+tetha_2_decdeg=tetha_2_degrees+(tetha_2_minutes/60)

+d_110=lambda/(2*sind(tetha_2_decdeg))

+a=d_110*sqrt(h^2+k^2+l^2)

+mprintf("The lattice parameter is = %1.4f nm\n",a)

+mprintf("The lattice parameters are not equal,hence metal is not bcc\n")

+mprintf("We assume that the metal is fcc,lattice parameter is consistent at value=0.296 nm\n") //by multiplying d_110 by sqrt(3) and d_200 by sqrt(4)

+

+//for atomice diameter we have

+a=0.296 //lattice parameter in nm

+D=a/sqrt(2)

+mprintf("The atomic diameter is = %1.4f nm",D)