Answer
See explanation.
Work Step by Step
For the hydrogen atom, the ground state has quantum number n = 1, the next one is n = 2, and the next one is n = 3. This is explained in section 39.3.
For the particle in a box, the ground state has quantum number n = 1, the next one is n = 2, and the next one is n = 3. This is explained in section 40.2.
For the harmonic oscillator, the ground state has quantum number n = 0, the next one is n = 1, and the next one is n = 2. This is explained in section 40.5.
