Particles, antiparticles and photons (AQA A-Level Physics): Flashcards

Same mass & rest energy as particle, opposite charge

Positron

$+1.6 \times 10^{-19}$ C

0.511 MeV

Particles of EM radiation with energy, no mass

$E = hf = \frac{hc}{\lambda}$

$6.63 \times 10^{-34}$ J s

Particle & antiparticle collide, become energy

Two gamma photons in opposite directions

High-energy photon → particle-antiparticle pair