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+//Example number 5.3, Page number 85
+
+clc;clear;
+close;
+
+//Variable declaration
+me=9.1*10**-31;    //mass(kg)
+h=6.62*10**-34;   //plank constant
+mn=1.676*10**-27;    //mass(kg)
+c=3*10**8;     //velocity of light(m/s)
+//Calculation
+lamda=h*10**10/sqrt(4*mn*me*c**2);     //de broglie wavelength(angstrom)  
+//Result
+printf("de broglie wavelength is %.1e Angstrom",lamda)