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+clear
+//
+//
+//
+
+//Variable declaration
+h=1
+k=1
+l=1 //miller indices
+a=0.352 //lattice parameter(nm)
+theta=(28+(30/60))*%pi/180 //angle(radian)
+hp=6.626*10**-34 //plancks constant(Js)
+m=1.67*10**-27 //mass of proton(kg)
+kB=1.38*10**-23 //boltzmann constant
+
+//Calculation
+d=a/sqrt(h**2+k**2+l**2)
+lamda=2*d*sin(theta) //wavelength(nm)
+T=(hp**2)/(3*m*kB*(lamda*10**-9)**2) //effective temperature of neutrons(K)
+
+//Result
+printf("\n effective temperature of neutrons is %0.0f K",T)