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//Calculate the Energy of Helium ion its first excited state
//Example 43.1
clear;
clc;
Rhc=13.6;//Product of Rydberg's Constant, Plancks Constant and Speed of Light (Rhc) in eV
Z=2;//Atomic Number for Helium Ion
n=2;//First Excited State
E=-Rhc*Z^2/n^2;//Energy of Helium Ion in the first excited state in eV
printf("Energy of Helium Ion in the first excited state = %.1f eV",E);
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