Question
A hypothetical one-electron atom in its highest excited state can only emit photons of energy $2E, 3E$, and $5E$ before reaching the ground state. Which of the following represents the complete set of energy levels for this atom?
1. $0, 3E, 5E$
2. $0, 2E, 3E$
3. $0, 2E, 3E, 5E$
4. $0, 5E, 8E, 10E$