PeroK's latest activity
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PeroK reacted to JimWhoKnew's post in the thread Undergrad Antiproton and positron annihilation with
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An antiproton can't annihilate itself with a positron. They are not each other's antiparticle. An antiproton can "capture" a positron to... -
PeroK replied to the thread Undergrad Antiproton and positron annihilation.Generally annhiliation is between a particle and its antiparticle. The interaction between an antiproton and a positron would be... -
PeroK reacted to GlitchedGluon's post in the thread Particle Neutrino Particle Physics Book with
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You may also find useful the PDG Review of Particle Physics: https://pdg.lbl.gov/2025/html/computer_read.html In particular Section 14... -
PeroK replied to the thread Undergrad Angular Momentum Vector and Its Magnitude.In general an expected value does not itself need to be one of the possible values. For example, the expected value of a roll of a... -
PeroK replied to the thread Particle Neutrino Particle Physics Book.Is this useful? https://arxiv.org/abs/hep-ph/0510213 -
PeroK replied to the thread Foundations A rigorous approach to learn Mathematics.I'm not convinced by this. Introductory books on Abstract Algebra, Number Theory and Real Analysis etc. would cover a lot of general... -
PeroK reacted to wrobel's post in the thread Foundations A rigorous approach to learn Mathematics with
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Actually not. Moreover in most cases it is counterproductive. -
PeroK reacted to vela's post in the thread Engineering Why wasn’t gravity included in the potential energy for this problem? with
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Given the method, I think you should include the potential energy due to gravity (though you should've had ##-mgx##). It feels a bit... -
PeroK replied to the thread Undergrad A question about the origin of Coulomb's law and point charge divergence.Coulomb's law breaks down for high-energy scattering. QED predicts this and presents Coulomb's law as a low-energy approximation... -
PeroK replied to the thread Engineering Why wasn’t gravity included in the potential energy for this problem?.It is taken into account. See figure 2.5.4 and the subsequent calculations. But, it cancels out of the final equation for SHM. Once... -
PeroK replied to the thread Engineering Why wasn’t gravity included in the potential energy for this problem?.This doesn't take into account that the equilibrium position depends on gravity. See the analysis I linked to. -
PeroK replied to the thread Engineering Why wasn’t gravity included in the potential energy for this problem?.Have you ever studied a mass oscillating vertically on a spring? It might be easier to look at that problem first and figure out why... -
PeroK replied to the thread Engineering Why wasn’t gravity included in the potential energy for this problem?.Why not add GPE to the analysis and see what equations you get? -
PeroK replied to the thread Undergrad Question about photon entanglement and causality.Here is an explanantion of why the quantum eraser does not imply retrocausality: -
PeroK reacted to renormalize's post in the thread Undergrad A question about the origin of Coulomb's law and point charge divergence with
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How does this formula compare to the well-verified results from QED? In particular, where does Planck's constant ##h## enter it?