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clear
//
//
//
//Variable declaration
h=6.62*10^-34; //planck's constant(J-sec)
m=9*10^-31; //mass of neutron(kg)
e=1.6*10^-19; //charge of electron(c)
V=344; //potential difference(V)
theta=60*%pi/180; //angle(radian)
//Calculations
d=h*10^10/(2*sin(theta)*sqrt(2*m*e*V)); //interplanar spacing(angstrom)
//Result
printf("\n interplanar spacing is %0.2f angstrom",d)
printf("\n answer in the book is wrong")
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