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//Calculate radius of the smallest orbit of the Hydrogen atom
//Example 14.2
clc;
clear;
Eo=8.8542*10^-12; //Permittivity of free space in C^2 N^-1 m^-2
h=6.626*10^-34; //Planck's constant in j s
Me=9.109*10^-31; //Mass of the electron in kg
e=1.602*10^-19; //Charge of an electron in C
n=1; //Quantum number
Z=1; //Atomic number of Hydrogen atom
r1=((n^2)*(h^2)*Eo)/((Z*%pi*Me)*(e^2)); //Radius of the Bohr orbit in m
r=r1/10^-10; //Radius of the Bohr orbit in A
printf("radius of the smallest orbit of the Hydrogen atom = %.3f A",r);
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