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//Example number 5.1, Page number 85
clc;clear;
close;
//Variable declaration
e=1.6*10**-19; //charge(c)
m=9.1*10**-31; //mass(kg)
h=6.626*10**-34; //plank constant
E=2000; //energy(eV)
//Calculation
lamda=h/sqrt(2*m*E*e)*10**9; //wavelength(nm)
//Result
printf("wavelength is %.4f nm",lamda)
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