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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)