In the rare decay \pi^+ \rightarrow e ^+ + \nu_ e , what is the kinetic energy of the positron? Assume the \pi^+ decays from rest and m_\nu = 0.

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Giancoli's Physics: Principles with Applications, 7th Edition

Elementary Particles

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32-1: Particles and Accelerators

32-2 to 32-6: Particle Interactions, Particle Exchange

32-7 to 32-11: Resonances, Standard Model, Quarks, QCD, GUT

Problem 24

In the rare decay $\pi^+ \rightarrow \textrm{e}^+$ + $\nu_\textrm{e}$ , what is the kinetic energy of the positron? Assume the $\pi^+$ decays from rest and $m_\nu = 0$ .

69.3 \textrm{ MeV}

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In the rare decay π+→e+\pi^+ \rightarrow \textrm{e}^+π+→e+ + νe\nu_\textrm{e}νe​, what is the kinetic energy of the positron? Assume the π+\pi^+π+ decays from rest and mν=0m_\nu = 0mν​=0.

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In the rare decay $\pi^+ \rightarrow \textrm{e}^+$ + $\nu_\textrm{e}$ , what is the kinetic energy of the positron? Assume the $\pi^+$ decays from rest and $m_\nu = 0$ .