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diff --git a/1694/CH1/EX1.29/EX1_29.sce b/1694/CH1/EX1.29/EX1_29.sce
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+clear;
+clc;
+printf("\nEx1.29\n");
+//page no.-37
+//given
+n=1;..........//order
+theta=27.5;....//angle in degrees
+h=1;
+k=1;
+l=1;
+a=5.63*10^-10;......//lattice constant in m
+h=6.625*10^-34;.....//planck's constant
+c=3*10^10;...........//speed in m/sec
+d=a/sqrt(h^2+k^2+l^2)..........//interplanar spacingin m
+//by bragg's law
+
+lambda=(2*d*sind(theta))/n......//wavelength in m
+
+printf("\nwavelength is 3 angstrom\n");
+
+E=h*c/lambda..........//energy of x-ray beam in joule
+//to covert in eV divide by 1.6*10^-19
+
+printf("\nenergy of X-ray beam is 3379.18 eV\n");