Quantum, Atomic, and Nuclear Physics Overview — AP Physics 2
1. Unit at a Glance
This unit follows a logical learning arc that begins with foundational discoveries that upended classical physics: the particle nature of light and quantum behavior of all matter. We then build up from atomic-scale electron behavior to the atomic nucleus, covering the forces that hold nuclei together, how they decay, and the enormous energy released when mass converts to energy in nuclear reactions.
All concepts in this unit tie back to core conservation laws (energy, charge, mass number) that you have used throughout the course, while introducing new counterintuitive quantum properties that apply only at the smallest scales.
Common Pitfalls
Why: Intensity (number of photons) does not change the maximum kinetic energy of ejected electrons, only frequency (energy per photon) does
Why: Mass defect is the difference between the mass of separate nucleons and the mass of the bound nucleus
Why: Both charge (atomic number) and mass number are always conserved