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clear
//
//
//
//Variable declaration
d=2.82*10^-10; //lattice spacing(m)
sintheta=1;
n=1;
//Calculation
lamda_max=2*d*sintheta/n; //longest wavelength(m)
//Result
printf("\n longest wavelength is %0.3f angstrom",lamda_max*10^10)
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