Particles and Radiation (AQA A-Level Physics): Flashcards

Unstable nucleus releases alpha particle (2 protons, 2 neutrons)

Particle + antiparticle → 2 gamma photons (energy)

Same mass, opposite charge & quantum numbers

+1 for baryons, -1 for antibaryons

3 quarks

$1.6 \times 10^{-19}$ J

$E = hf$

Lowest energy level an electron can occupy in an atom

Same element, same protons, different neutrons

Minimum energy to release electron from metal surface