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clear
//
//
//
//Variable declaration
a=5.63*10**-10 //lattice constant(m)
h=1
k=1
l=1 //miller indices
theta=27.5*%pi/180 //glancing angle(radian)
n=1 //order
h=6.625*10**-34 //planck's constant
c=3*10**10 //velocity of light(m/sec)
e=1.6*10**-19 //charge of electron(c)
//Calculation
d111=a/sqrt(h**2+k**2+l**2)
lamda=2*d111*sin(theta)/n //wavelength of X-ray beam(m)
lamda=int(lamda*10**10) //wavelength of X-ray beam(angstrom)
E=h*c/(lamda*10**-10*e) //energy of X-ray beam(eV)
//Result
printf("\n wavelength of X-ray beam is %0.3f angstrom",lamda)
printf("\n energy of X-ray beam is %0.2f *10**5 eV",E/10**5)
printf("\n answer for energy given in the book is wrong")
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