Positron is the antiparticle of an elect...

Positron is the antiparticle of an electron .It has the same mass as an electron but the opposite charge An electron and a positron moving towards each other with equal and opposite velocities.

can annihilate into one photon. Conserving both energy and momentum

cannot annihilate into one photon because energy cannot be conserved

cannot annihilate into one photon because momentum cannot be conserved

cannot annihilate into one photon because charge cannot be conserved

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