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//To calculate the spacing of crystal
V = 344; //potential, V
lamda = 12.26/sqrt(V); //de Broglie wavelength, armstrong
lamda_m = lamda*10^-10; //de Broglie wavelength, m
n = 1; //for 1st reflection maximum
theta = 60; //glancing angle, degrees
d = n*lamda_m/(2*sind(theta)); //interatomic spacing, m
d = d*10^10; //interatomic spacing, armstrong
printf("interatomic spacing of crystal is %5.4f armstrong",d);
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