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pmb

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Everything posted by pmb

  1. You have to be cautious in forums suchs this. Different people mean different things when they use the term mass. For example, in A first course in general relativity by Bernrd F. Schutz the author writes on page 94 ..energy and 'inertial mass' are frame dependant ... and on page 104 he writes ...energy and mass are the same.... Other people refer to mass as being synonymous with proper mass. Severian is talking about proper mass (aka rest mass). I think that with this in mind you'll better understand the subject matter. The way Taylor and Wheeler describe mass then in such explosions th
  2. This thread degenerated into a stream of insults so I deleted all my posts.
  3. It's hardly silly. Many relativity textbooks us it. Percentage wise about 67% of textbooks published between 1970 and now use it. I see no valid reason to think it silly when that many physicists use it That's incorrect. I was speaking to a well-known cosmologist/particle physicist yesterday and he told me that in cosmology physicists use the term "mass" to refer to E/c2. H'e's very very well-known in his field so I trust him. Plus I have several relativity texts which prove otherwise. The list inlcludes such texts by such authors as Misner Thorne and Wheeler (page 141), Mould, Rindler,
  4. Hello Folks! I'm newly back and want to say hello and that I sure missed some of you. I miss some lively and challanging threads with some people I have a lot of respect for. Thanks for being here folks! Now that I'm back I want to fresh and not make any mistakes and get a better understanding of the rules. I seemed to have posted things that I wasn't in the wave-particle duality thread. So I want to learn what to do in certain instances. Not only from moderators but mainly from other members who've run into similar situations and was able to resolve it to their satisfaction without g
  5. I don't know what this is supposed to say. It appears to say Total Mass of Sun = Mass of Sun + Photon Mass of the Sun The mass of the sun is a complicated function of the mass-energy of the particles in the plasma that mack up all the matter of the sun, radiation included. This includes the rest mass of all the nuclei in the sun plus the kinetic energy of all those nuclei. This includes the contribution to the mass of the sun by the radiation in the sun, i.e. photons. To be precise, pressure is also a source of gravity. It has more relevance for objects such as neutron stars. The activ
  6. Comments such as this on the graduate level text I quoted you, and which you failed to shoot down, doesn't speak well for the quality of your opinion. There simply doesn't exist a text or a peer reviewed physics journal article which says the the wave-particle duality is a myth. Many of us, such as myself, know quantum mechanics very well (graduate level) and know what you've been claiming is total nonsense. Don't you understand that? My appologies. I was simply commenting on the tact that I'm taking here.
  7. I haven't insulted juan and I never said anything rude. I also haven't stated something that wasn't true, e.g. that I never said a particle is a wave. The worst thing I did was to point out that juan was using a personal attack on immortal and is inccesant false accusations claiming I said something which I'd never say to anybody. It really bothers me to see people insult/attack others. But in order to take on a new state of politeness and civilness I have deleted those remarks. What are we supposed to do when people make false accusations? You give off the impression that it I say that s
  8. You're wrong. I already told you that and you simply ignored it. That is not how a cogent argument progresses. Prove me wrong. Reference a post where I said a particle is a wave. Until then stop putting words into my mouth.
  9. I myself go by books for the basics of physics and this is a well-known fact in quantum mechanics and is quite often addressed in text books. That's why I rely on them so much. Papers don't address basic physics for the most part so its much harder to find such an article. Here is a section from Shankar's QM text (graduate level). From Principles of Quantum mechanics - 2nd Ed. by R. Shankar (graduate level quantum mechanics text), page 113 That and [math]\lambda = h/p[/math] expresses the wave-particle duality. He's very selective about what he posts. I guess that's just human beh
  10. While I don't condone that behaviour I believe that I can, to a certain extent, empathize with your feeling. It appears that way to me too. I hope you change your mind. I find this place more tolerable with you here. From our discussions in private I've gotten to know you personally and that side of you doesn't come out here. If it did then I'm sure you wouldn't run into such problems.
  11. Today I followed an ad hoc derivation of Schrodinger's equation. I confirmed what I long knew, i.e. that a wave function of the form [math]\psi(x, t) = Ae^{i(kx - \omega t)}[/math] is a solution to both Schrodinger's equation and the wave equations. Are you familiar with such a derivation?
  12. Please don't put words into my mouth. I never said any such thing. In my opinion your arguement is flawed in that nobody has suggested that a single particle is a wave, nobody whatsoever, and your arguements are based soley on that false assuption that someone said that particle is a wave. Nobody said that in this thread. Lok for yourself. If what you say is true then you'd be able to give us a post number where it occured. I myself have never said, thought, or implied any such thing. Herein lies the flaw in your argument. In fact in my very first post in this thread, i.e. post #16, I
  13. Nobody in this thread has suggested that a particle is a wave. That's why I quoted Feynman. He said just the opposite, i.e. from post #16 See what I mean? We know that they don't behave like waves.
  14. All that means is that the people that you're quoting don't understand the wave-particle duality. What part of [math]\lambda = \frac{h}{p}[/math] probability density = [math]|\psi(x)|^2[/math] don't you understand? Those two relations epitomizes the wave-particle duality. Which of those two expression are you claiming is wrong and why?
  15. What can I say? I was frustrated at his wild accusations and him getting all flustered about something that appears only to have happened in his mind and not in reality. For example: CaptainPanic - I reviewed my contribution in the most recent thread in the suggestions section, i.e. the one about the rep-system. You claimed that I have 94 (!) posts in the Suggestions, Comments and Support section. I have no way to verify and examine those posts to see what they were about. So what I did was to examine the thread I knew about, i.e. the one about the "reputation system" thread. Her
  16. I don't understand why you keep putting words into my mouth? I never suggested that moderators generally abuse their powers. I wouldn't even believe it someone claimed it. And that's all I asked, i.e. I only asked two questions about it. That's correct. They were. Again with the exageration? Why do you keep doing that? You are quite wrong in yoru accusation that I never stop. As far as I'm concerned I only had two questions. One in the "reputation system" thread and one here. Both of them was addressed to my satisfaction. The one here was addressed back at ppst #8. After tha
  17. Opinions are sought on the subject matter, not on off topic distractions such as silly things like me asking swansont why he was frustrated over a disagreement. Yes. That's what I stated. But that wasn't the question. The question was Would you say that this is an ad hominem? which was a question asked about a particular ad hominem. What you commented on was something that was not on topic, i.e. not about that particular a hominem. But if you thought it neccesary to ask about that then you didn't need to be rude about it.
  18. You're being unfair. All my questions were basically answered in post #8 where you told us that moderators are bound by the same rules that we are. Yes. I bitch when I see a moderator post a comment which I percieve as rude. Big deal. I do the same thing when I see anybody being rude. Why should moderators be exempt? People in positions of autority usually aren't above the laws they enforce. Is that different here? Are moderators really so darned offended when we ask them questions about their job? You make it appear as if inquiries are really condamnations. They aren't. Anybody who thinks tha
  19. You're acting like your their mother when in fact they're grown adults who are responsible for their actions. Its not as if they're children who can't control their actions. All I'm saying is that they shouldn't be hypocrits, that they shoulld act like they're expecting us to act. Being human doesn't mean that they are incapable of doing that. All moderators are capable of posting moderatror comments in the polite fashion that they expect us to post our responses. Let us recall what this forum is. The subect matter for this forum is Suggestions, Comments and Support. That's why I posted t
  20. Myself, moderators expect us to be polite, which I appreciate. I very much enjoy a forum where the membrs are polite so I appreciate that kind of thing. However there are a few moderators who aren't always polite themselves and they really should be, expecially when they're moderating. Otherwise moderator directions, comming from somone who is expressing anger or impatience, can actually work against calming people down and as a result some members, unfortunately even me in the past, then feel the need snap back in kind. I'm working to get that under control on my end but its hard when someone
  21. No. Magnetic fields cannot correctly be thought of as moving. They can be thought ofhas hava direction though and given the Lorentx force acting on an alpha particle I would expect the results you just reported. Where did you get a cloud chamber and source of alpha particles from if I may ask?
  22. Thanks. I appreciate that. Yeah. I know. I've found it helpful to talk to people in PM about these kinds of things. It turns out that the people you might apprear to be real jerks turn out to be very nice people. You jnust need to get to know them, that's all. I found it to be a very rewarding experience myself. A real education too. Yeah, but a conversation consists of more than one person. If the conversatin continued for 14 pages then it was caused, in part, by the moderators defending themselves. No matter what the circumstances are, when someone is trying to defend their actio
  23. These kinds of things are private which means that they came in PM and therefore it should remain there. A few days I anonymously discussed such a PM. Even though I kept it private as to who was who the other person was very upset that I mentioned in in open forum. Therefore I don't want to make the same mistake again. I'd be glad to discuss it with you in PM though if you want. If so then please send me a PM stating what you want to know. I'l considerate to make sure its not something someone could get angry with me again and we can go from there.
  24. Yeah. I'm well aware of that but there's nothing I can do about it. With accolations sometimes come objections. While iI'm interested in discussing moderator actions and responsinilities it doesn't mean I can force people from going off topic. But responding to negative emotions acts to keep those emotions alive. It's best to avoid acknowledging negative emotions. But even then its sometimes getting people to open up about negative feelings that have been raised can sometimes be a good thing, kind of a carthartic thing. Just remember that when you respond to them you're doing the same thin
  25. Please don't exagerate the purpose of this thread. The moderators are grown adults. They can take care of themselves. You're making it appear as if this is a crap-on-moderator thread for some reason. It's not. The openting post stated its purpose, i.e. For the most part the moderators are really wonderful and I admire them. This forum's moderators beat out other forum moderators. But the question did come up about what moderators do around here and I was curious as to whether they hold themselves to the same standards that they holdus against. Cap'n Refsmmat has explained all that to me so
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