Assertion: electron's antiparticle | /r/HasAspect | net momentum
Facets:
value: in the center of momentum frame
type: LOCATION
Source sentences:
text: In the center of momentum frame, the colliding antiparticles have no net momentum, whereas a single photon always has momentum (since, as we have seen, it is determined by the photon's frequency or wavelength, which cannot be zero).