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An electron and a positron moving at small speeds collide and annihilate each other. Find the energy of the resulting gamma photon.

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An electron and a positron moving at small speeds collide and annihilate each other. Find the energy of the resulting gamma photon.
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1 Answer

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Mass of Electron = Mass of positron = 9.1x10–31 Kg

Both are oppositely charged and they annihilate each other.

Hence, Δm = m + m = 2 x 9.1 x 10–31 Kg

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