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//Example 5_14_u1
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 //units in m^2 kg s^-1
m=1.67*10^-27 //units in Kgs
KB=1.38*10^-23 //units in m^2 kg s^-2 K^-1
lamda=lamda*10^-9 //units in meters
T=h^2/(3*m*KB*lamda^2) //units in K
printf("The effective temprature of neutrons is T=%dK",T)
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