Which of the following has the mass closest in value to that of the positron? (1a.m.u=931MeV)
A
Proton
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B
Electron
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C
Photon
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D
Neutrino
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Solution
The correct option is B Electron A positron is a particle of matter with the same mass as an electron but an opposite charge. Positron is the antiparticle of electron.