The 2p state level in hydrogen is 6-fold degenerate when the spin is taken into account (3 possible values for m and 2 possible values for ms). On the other hand, in the presence of a magnetic field, the anomalous Zeeman effect splits this level into five energy levels: energy levels. That means that one of those five levels must be degenerate. Which is it?
  1. energy levels
  2. energy levels
  3. energy levels
  4. energy levels
  5. energy levels



A hydrogen atom is placed in a magnetic field. How many energy levels do the normally degenerate 4f states split into?
  1. 1
  2. 3
  3. 4
  4. 8
  5. 9



Which of the following electronic configurations are possible?
  1. 3 1s electrons, two with spin up and one with spin down
  2. 2 1p electrons, one with spin up and one with spin down
  3. 4 2p electrons, two with spin up and two with spin down
  4. 4 2p electrons, all with spin up
  5. 2 3s electrons, one with spin up and one with spin down
  6. 5 3d electrons, all with spin up
  7. one 1s and one 2s electron, both with spin up



A classical magnetic moment is placed in a magnetic field which makes a nonzero angle of θ with it. What will the subsquent motion of the magnetic moment be in the absence of any other forces?
  1. Its orientation will oscillate back and forth.
  2. Its position will oscillate back and forth.
  3. It will align itself with the magnetic field.
  4. It will accelerate in the direction of the magnetic field.
  5. It won't move.



A stationary electron is put in a uniform magnetic field. Describe its subsequent motion.
  1. Nothing will change.
  2. Its position will oscillate back and forth.
  3. Its orientation will oscillate back and forth.
  4. It will accelerate in the direction of the magnetic field.
  5. It will align itself with the magnetic field.



In the Stern-Gerlach experiment, a beam of spin-1/2 silver atoms passed through a non-uniform magnetic field. Because of the spin of the atoms and the fact that the potential energy changed with position, there was a net force on the silver atoms which was in one direction for spin-up atoms and the opposite direction for spin-down atoms. What do you think Stern and Gerlach saw when they ran this experiment?
  1. The original beam split into two distinct beams, one for spin-up and one for spin-down.
  2. The original beam wasn't spread out since the average spin was zero.
  3. The orignal beam was spread out in a broad direction for each continuous possible orientation of the spin.
  4. The original beam was spread into three peaks: spin up, spin down, and spin zero.
  5. The beam didn't spread out because no "measurement" was made.