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martillo

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martillo last won the day on October 25 2023

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    Uruguay
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    Electrical Engineer
  • Favorite Area of Science
    Physics and Metaphysics

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  1. So, two large threads devoted to the discussion about "free will" and there's no agreement even in its definition yet. Well, we are in the Philosophy forum and in general Philosophy limits itself to present the positions of different philosophers and does not resolve which is right or wrong leaving to the readers the possibility to choose one or even develop yet other one of his own if that would be possible. I don't expect any agreement in these discussions, endless discussions...
  2. Yes, another planet, other sun, without dangerous cosmic rays, no asteroids that could provoque massive extinctions, in other galaxy because this one is going to collide with the near Andromeda galaxy and so on. Would there be a really good place for people to live a really good life in the entire universe? I think not. May be in other universe and may be even with some change in the physics' laws, not this one.
  3. Yes, lot of coincidences allow life in this planet and still with lot of problems. The reality is hard, nothing easy. Sure and many species got extinct. Even our own future is not very certain after all.
  4. Too much diseases, calamities, catastrophes and tragedies. Seems the Universe is not well "tunned" for an ideal kind of life. We live as we can...
  5. May be I have read your post too fast. I thought you were making that association, something I didn't like. I got confused, I agree. May be yes. English is not my natural language and I get confused sometimes. Negative -1 reaction to your post removed.
  6. Your post is not an objective overview. You are just promoting your compatibilist position here. For instance: The libertarian position does not say that. It says that people can change their situation because the future is undetermined and their choices and actions can influence the future. Of course without total certainty because everything depends not only in our choices and decisions but also in the conditions of the situation, the environment, other people, society, etc, and even the luck because randomness also plays a role in the universe which is yet another source of indeterminism in the future. You just want to promote your position here. It is not a look for the real true thing. Useless discussion for me.
  7. I have highlighted a point I am particularly interested. As you say voltmeters actually measure current. The current passes through an internal resistance and they take the voltage over that resistance to move a needle or generate a number in a digital display. Two questions: In which way could a voltage be measured directly? Is there any known case where the voltage has been measured directly? I'm particularly interested about high voltage measurements.
  8. I was reading something about that Schrodinger found problems in the development of his equation with some things related to Relativity and so he at the end developed a non relativistic equation. The relativistic Klein-Gordon equation was developed after. Lot of new things being developed quite at the same time in those years... Seems I would need to enter deeper into QM to be able to understand the thing... I just want to ask you now the same as to @joigus:
  9. What I don't get is that you have E, you have p so, why can't you have E/p. What does the quotient E/p means to you? Why to not just associate vp = E/p? I don't get it. As I already said to @joigus "quantum uncertainty" just puts a limit in the precision on the determination of some quantity. It does not means some quantity would be not determinable. Different things.
  10. I still don't get it. We cannot see energy or momentum but we can determine their values. Not observable, not directly measurable but determinable. Why not the same for the phase velocity? If the energy E and the momentum p can be determined the quantity E/p is determinable and so vp = E/p is determinable. The uncertainty principle puts a limit in the precision of the determination of course but this does not mean is not determinable. It would be determinable under an appropriated degree of certainty.
  11. Could I say then that the phase is not measurable but it is determinable? I mean we cannot experimentally measure it but we could determine it. Could it has sense this way? "Matter waves" could be just abstract things in our mind but we should be able to know about their properties like their wavelength, their group velocity and why not their phase velocity? "Particles", "waves", everything is just models in our minds but why we cannot have good models with well determined properties? Isn't it the main purpose of Physics to elaborate good models for everything? We should be able to know all the properties of those models even if they were just abstractions in our minds...
  12. Then f = vp/λ Now λ is measurable (λ = h/p) and vp is measurable from vp = E/p. I conclude f is measurable...
  13. Which formula do you apply to obtain vp with λ and f? By the way, seems f is not measurable...
  14. So returning to the initial discussion about the phase velocity of the "matter wave" of massive particles... I arrived to the two approaches that could give the phase velocity vp in terms of the linear velocity v of the particles: Relativistic approach: vp = c2/v Non-relativistic approach: vp = v/2 (vg = v) Independently of which one would be better in whatever case, if v is measurable then vp is measurable. The phase itself is not observable and not measurable but its velocity is measurable. The phase velocity is related to the energy and the momentum of the wave/particle: p = E/vp.
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