When an electron and a positron come together, they annihilate each other giving energy in the form of
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Gamma rays
In pair annihilation the whole rest mass of the electron and the positron is converted into electromagnetic energy, emitted as two photons. The energy of each photon is the rest energy of an electron.
\( \displaystyle E = m_e c^{2} \approx 0.511\,\mathrm{MeV} \)
Photons of about 0.5 MeV lie in the gamma-ray region.
NCERT (2026-27):
Points to Ponder – “… Electron and positron are a particle-antiparticle pair. They are identical in mass; their charges are equal in magnitude and opposite. ( It is found that when an electron and a positron come together, they annihilate each other giving energy in the form of gamma-ray photons.)”