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//To calculate the wavelength
m = 9.1*10^-31; //mass of electron, kg
h = 6.626*10^-34; //planck's constant
e = 1.6*10^-19;
E = 2000; //energy, eV
E = E*e; //energy, J
lamda = h/sqrt(2*m*E); //wavelength, m
lamda_nm = lamda*10^9; //velength, nm
printf("wavelength is %5.4f nm",lamda_nm);
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