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clear
//
//
//
//Variable declaration
n=4
A=107.87 //atomic weight
rho=10500 //density(kg/m**3)
N=6.02*10**26 //number of molecules
theta=19+(12/60) //angle(degrees)
h=1
k=1
l=1
h0=6.625*10**-34 //planck constant
c=3*10**8 //velocity of light(m/s)
e=1.6*10**-19 //charge(coulomb)
//Calculation
theta=theta*%pi/180 //angle(radian)
a=(n*A/(N*rho))**(1/3)
d=a*10**10/sqrt(h**2+k**2+l**2)
lamda=2*d*sin(theta) //wavelength of x rays(angstrom)
E=h0*c/(lamda*10**-10*e) //energy of x rays(eV)
//Result
printf("\n wavelength of x rays is %0.3f angstrom",lamda)
printf("\n answer varies due to rounding off errors")
printf("\n energy of x rays is %0.0f *10**3 eV",E/10**3)
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