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+clear;
+clc;
+printf("\nEx2.15\n");
+//page no.-63
+//given
+m=9.11*10^-31;.............//mass of e in kg
+E=1.6*10^-15;..............//energy in joule
+h=6.625*10^-34;.............//planck's constant
+d=5.5*10^-11;...............//interplanar spacing in m
+//we knoe , E=m*v^2/2
+
+v=sqrt((2*E)/m);..........//velocity in m/s
+//By debroglie relationship
+
+lambda=h/sqrt(2*m*E)...........//wavelength in m
+
+//By bragg's eq. 2*d*sind(theta)=n*lambda
+//n=1, for first order 
+theta=asind(lambda/(2*d))..............//angle of deviation
+
+printf("\nangle of deviation is 6.4 degree\n");