Which of the following is most unstable?

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(C) The correct answer is $C$. Free neutrons are unstable particles with a mean lifetime of approximately $880 \ s$ (often cited as $\approx 15 \ minu

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Neutrons

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(C) The correct answer is $C$. Free neutrons are unstable particles with a mean lifetime of approximately $880 \ s$ (often cited as $\approx 15 \ minutes$). They undergo beta-minus decay $(n ightarrow p + e^- + \bar{
u}_e)$ to become a proton, emitting an electron and an antineutrino in the process. In contrast, electrons and protons (in their free state) are stable particles.

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