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clear
//
//
//
//Variable declaration
h=6.62*10^-34; //planck's constant(J-sec)
mn=1.67*10^-27; //mass of neutron(kg)
k=1.38*10^-23; //boltzmann constant(eV/deg)
T=300; //temperature(K)
//Calculations
E=k*T; //energy(J)
p=sqrt(2*mn*E); //momentum
d=h*10^10/p; //interplanar spacing(angstrom)
//Result
printf("\n interplanar spacing is %0.2f angstrom",d)
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