Multiple choice

In which of the following processes, a proton is converted into a neutron?

  1. Positron emission

  2. Proton emission

  3. Neutron emission

  4. Electron capture
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A Correct answer
Explanation

Positron emission is a type of beta decay in which a proton is converted, via the weak force, to a neutron, releasing a positron (the antimatter counterpart of an electron) and a neutrino. Isotopes which undergo this decay and thereby emit positrons include carbon-11, potassium-40, nitrogen-13, oxygen-15, fluorine-18, and iodine-121.

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