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//Variable declaration
e=1.6*10**-19;
m=9.1*10**-31; //mass(kg)
h=6.63*10**-34; //planck's constant
E=2000; //energy(eV)
//Calculation
lamda=h/sqrt(2*m*E*e); //wavelength(m)
//Result
printf('wavelength is %0.4f nm\n ',(lamda*10**9))
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