Search results

  1. daisey

    B Is Space Expanding in a Relativistic Way?

    It's not a textbook, and it is not a book on cosmology. The book is called: "Time Explained", by Michael Savins. Here is the quote from his book. "The Universe is expanding and that expansion is accelerating but at the same rate as a metre measuring rod is increasing in length. The universe...
  2. daisey

    B Is Space Expanding in a Relativistic Way?

    I agree the length of a meter does not change, but only relative to the expansion of space. The universe has always been the same width in "meters". And the length of a meter always remains "the length of the path traveled by light in a vacuum in 1/299,792,458 of a second" because as space...
  3. daisey

    B Is Space Expanding in a Relativistic Way?

    Then what is meant by "the scale of space itself changes" in the following sentence?: "The metric expansion of space is the increase of the distance between two distant parts of the universe with time.[1] It is an intrinsic expansion whereby the scale of space itself changes"...
  4. daisey

    B Is Space Expanding in a Relativistic Way?

    Regarding the expansion of space.... In one book I've read the diameter of the universe is more than 100B light years across, even though the age of the universe is only roughly 14B years old. This is due to accelerated expansion of space. In another book it says that space is expanding in a...
  5. daisey

    Quantum Zeno Effect - Explained

    When you say above "when you measure", do you mean to say "when you start measuring"? Does the Quantum Zeno effect not work reliably when the observer begins taking measurements late into what is considered (I guess) the so-called half-life of the subject particle?
  6. daisey

    Quantum Zeno Effect - Explained

    I've heard an interesting explanation of how the Quantum Zeno effect works, but I am still confused. Here is a summary of that explanation, as I understood it... When constant observations (or a series of observations taken at very short intervals) are made of a system in a superposition of...
  7. daisey

    Mass of the Electron

    I thought that somewhere I read the Electron has no intrinsic mass, but instead gains it's mass via interaction with the Higg's field. But I found no reference to this in the electron's Wikipedia definition (although it is a long article, and I might have missed it). So what is true about...
  8. daisey

    Is Gravity a Force or Not?

    I didn't mean to misquote Einstein. When I said that Einstein "said" that about gravity, I meant via his General Theory of Relativity. Although chances are I don't completely understand that theory.
  9. daisey

    Is Gravity a Force or Not?

    I believe what you are saying is there are multiple theories on what causes gravity. And the Graviton is not part of Einstein's General Theory of Relativity. I am only familiar (in a very general sense, at that, no pun intended) with General Relativity. I know absolutely nothing about Quantum...
  10. daisey

    Is Gravity a Force or Not?

    My apologies - in my question I should have stated "spacetime", not "space". For those that above are saying that gravity is the curvature of spacetime, can you please give me a simplified description of what the graviton is and what part it plays in curving spacetime? Or is there no way...
  11. daisey

    Is Gravity a Force or Not?

    I have read a number of books that claim that, according to Einstein, gravity is not a force, but instead the curvature of space caused by mass. And some of those same books then go on to refer to it as a force, mediated by the so-called undiscovered graviton. Can someone please explain if...
  12. daisey

    Is SPIN a calculated or physically measureable characteristic?

    I don't have the book in front of me, but I believe I remember reading (I paraphrase) the Photon's actual Spin was originally determined to be "2", and the Electron's "1". And for some reason they wanted to use the Photon's Spin as the baseline for comparison, so they "labeled" the Photon's...
  13. daisey

    Is SPIN a calculated or physically measureable characteristic?

    That is interesting Am I correct in assuming that "1" and "1/2" are only a description of the relationship of the magnitude of Spins?
  14. daisey

    Is SPIN a calculated or physically measureable characteristic?

    I am hearing that Spin is a property whose value is determined by calculation after measuring the effect it has on another directly measurable property of that same particle, and that Spin cannot be directly measured.
  15. daisey

    Is SPIN a calculated or physically measureable characteristic?

    Regarding the term "Spin"... I've see a number of different descriptions. In the book I'm currently reading it says it is "loosely" the measure of the strength of rotational motion, and "technically" the measure of the quantity called angular momentum. It also states we consider the spin...
  16. daisey

    Quantum Zeno Effect and Decoherence

    Ken, Thanks for the reply and your patience. I'm not a student of physics. I just read books in my spare time. Some some of these concepts are a little hard for me to grasp. Wow. That makes sense. The books I've read that talked about, and tried to explain wave function collapse, I...
  17. daisey

    Quantum Zeno Effect and Decoherence

    I've read the Quantum Zeno (QZ) Effect is caused by Quantum Decoherence (QD), and that QD is, in general, a representation of the wave-function collapse of a quantum system (the Wikipedia explanation on this is confusing to me, to say the least). If I understand the QZ Effect correctly...
  18. daisey

    Gravity and the Formation of Stars

    Is it true that all stars were formed from H1 clouds left flating around from the Big Bang? Or does this H1 get recycled over and over? If so, that again means stars can be formed from widely dispersed H1 atoms, because a Supernova widely disperses its remnants, no? That would mean gravity is...
  19. daisey

    Gravity and the Formation of Stars

    That is interesting. I guess I could understand the gravitational effects if we assume the starting point is an already massive dense cloud of HI. But how does it get to be a dense cloud in the first place? Is this a remnant of the Big Bang? I gave the example of two HI atoms because I...
  20. daisey

    Gravity and the Formation of Stars

    Earlier today I took a break from following the thread here on the Fukushima Nuc Plant problems (very interesting, by the way) and watched some TV, specifically a show I recorded on the formation of Stars. It reminded me of something that has been bothering me for some time - Gravity and how it...
  21. daisey

    Plutonium and Neutron Emission

    Gotcha, I think. So now, in addition to Alpha, Beta, and Gamma radiation, there is a type related to spontaneous fission events which result in neutron emissions. From what I've read, the problems to humans with the former three types of radiation is their ionizing effects. What is the danger...
  22. daisey

    Plutonium and Neutron Emission

    I have been reading up on radioactivity (Wikipedia). I keep coming across articles which talk about emission of Neutrons (during Plutonium decay, for example). Now I know alpha radiation is basically Helium-4 nuclei, but that consists of both Protons and Neutrons combined in a nucleus. What...
  23. daisey

    Gamma Radiation

    Well, I remember seeing technicians on TV wearing white masks waving these electronic devices over people, and I thought they were measuring radioactivity. Maybe they were measuring radioactivity from inhaled contaminants, which I understand do radiate for some time.
  24. daisey

    Gamma Radiation

    When you see someone take a device (Geiger Counter?) on tv to measure the amount of radiation one has received, if the body is no longer radioactive, what is the device measuring? Or do those devices not work for Gamma radiation?
  25. daisey

    Gamma Radiation

    OK. So the few photons that do not pass through the body strikes (or otherwise modifies) the atoms comprising the cells inside our bodies. How do these photons now make out bodies "radioactive"? What makes the effect an ongoing reaction inside the body?
  26. daisey

    Gamma Radiation

    Question about Gamma Radiation. I understand that Gamma Radiation, like X-Rays, are just photons (light particles) at different frequencies. I was reading an article about the Nuclear Plant problems in Japan, and the article stated that photons from Gamma Radiation for the most part pass...
  27. daisey

    Can virtual particles break the law that energy cannot be created or destroyed?

    Going back to the original question, since these virtual particles are continually appearing and disappearing, is it possible that the appearance of one pair of particles is "borrowing" the energy from another pair of particles somewhere that just disappeared? In that sense, energy is really...
  28. daisey

    Need help explaining light speed limit to younger brother

    If your question is "why can an object with mass physically not exceed the speed of light", I think you have already answered it. It would take an infinite amount of energy. If your asking "Why is the speed of light the limitation that it is in our world", as opposed to, "why the...
  29. daisey

    Motion and the Warping of Space

    I was reading that a stationary observer measuring an object in (very fast) motion would determine the object to be shorter in the direction of travel, compared to the size of that object measured at rest. What actually causes this difference from the perspective of the observer? Does the...
  30. daisey

    Why does mass cause gravity

    I've read comments here that refer to Gravity both as a force as warped space-time. Can it be both? A force has a force-carrying particle, and as stated above is the not-yet-observed graviton for Gravity. Does the graviton actually perform the warping of space-time?
Top