Assertion: cosmic ray's electron | /r/HasProperty | mass 0.511 mev/c2
Facets:
Source sentences:
text: The mesonic component consists of kaons (K) and pions (π) which degrade to muons (µ) (muons (mass 105.7 MeV/c2), electrons (mass 0.511 MeV/c2) and tau (mass 1777.8 MeV/c2) are all leptons, which have no sub-structure and are not composed of simpler particles).