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+//Example 5_14
+clc();
+clear;
+//To calculate the effective temprature of neutrons
+a=0.352     //units in nm
+h=1
+k=1
+l=1
+d=a/sqrt(h^2+k^2+l^2)        //units in nm
+theta=28.5          //units in degrees
+lamda=2*d*sin(theta*(%pi/180))         //units in nm
+h=6.63*10^-34      //Plancks Constant
+m=1.67*10^-27
+KB=1.38*10^-23
+lamda=lamda*10^-9         //units in mts
+T=h^2/(3*m*KB*lamda^2)
+printf("The effective temprature of neutrons is T=%dK",T)