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+//Example number 5.11, Page number 89
+
+clc;clear;
+close;
+
+//Variable declaration
+me=9.1*10**-31;    //mass(kg)
+mp=1.6*10**-27;    //mass(kg)
+h=6.626*10**-34;   //plank constant
+c=3*10**10;    //velocity of light(m/s)
+//Calculation
+lamda=h/sqrt(2*mp*me*c**2)*10**10;    //de broglie wavelength(m)
+//Result
+printf("de broglie wavelength is %.5e Angstrom",lamda)