Read the following passage adapted from an essay on mid-twentieth-century particle physics:
In December 1956, physicist Chien-Shiung Wu conducted a landmark experiment at the National Bureau of Standards to test the conservation of parity. To prepare the sample, Wu first cooled cobalt-60 atoms down to near absolute zero using liquid helium and magnetic demagnetization. Next, she applied a strong magnetic field to orient the spinning cobalt nuclei in a uniform direction. Once the alignment was successfully established, Wu monitored the emission of beta particles as the cobalt-60 underwent radioactive decay. She observed that significantly more electrons were emitted in the direction opposite to the spin of the nuclei. Finally, Wu compared these gathered observations with theoretical predictions to definitively demonstrate that parity was violated in weak nuclear interactions.
Based on the explicit details provided in the passage, in what chronological sequence did Chien-Shiung Wu perform the steps of her experiment from first to last?
- 1Cooling the cobalt-60 atoms down to near absolute zero
- 2Applying a strong magnetic field to orient the spinning cobalt nuclei
- 3Monitoring the directional emission of beta particles during radioactive decay
- 4Comparing the gathered emission observations with theoretical predictions