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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. daisey

    Energy of Atomic Electrons

    I was previously under the impression that an atomic electron in its lowest orbit has a larger wavelength than an electron in a higher atomic orbit. I read earlier today that lower orbiting electrons actually have smaller wavelengths. :confused: This seems backwards since electrons...
  12. daisey

    Atomic Components and the Absorption of Photons

    My question concerns my understand of the mechanics of the absorption of Photons by the components of atoms. I will use a common real-world example to facilitate my understanding of the concept. 1. When a rock (for example) sits in the sunlight, the rock warms to the touch. I believe this...
  13. daisey

    Wave Properties of Electrons and their Atomic Orbitals

    I understand that electrons are found inside Atoms within specific orbitals, or quantized distances from the nucleus. There are a maximum number of electrons found within each orbit, etc. etc. I recently read that the reason for this quantized nature of orbitals has to do with the wave...
  14. daisey

    Radioactive Decay

    Can anyone tell me what makes an atom unstable, and more prone to radioactive decay? From what I've read in books and on http://en.wikipedia.org/wiki/Nuclear_decay" [Broken], it's caused by flucutations in the quantum vacuum which disturb the nucleus. But why are some atoms more prone to be...
  15. daisey

    Point Particles vs. String Theory

    Up to now I have learned that matter particles (aka Leptons) were point particles with no physical size/extension. As a matter of fact, it appears that most (including many here based on responses to one of my earlier threads: https://www.physicsforums.com/showthread.php?t=301495") apparently...
  16. daisey

    Potential Energy and gravity

    I am now reading Rosenblum's and Kuttner's book "Quantum Enigma". In one of the first chapters they talk about the different forms of energy. Regarding Potential Energy, they give the example of a rock held in the air having potential energy because of the force of gravity. They go on to...
  17. daisey

    Electron's Orbit

    I am currently reading Kenneth W. Ford's book entitled "The Quantum World". In chapter 2 there is a section on Length, and in that section he talks about the size of atoms and electrons. He uses an analogy where the nucleus of a Hydrogen atom is the size of a basketball, and the electron...
  18. daisey

    Force Carriers, Mass, and Speed

    I understand the photon has no mass, and therefore accelerates to the speed of light instantly. There is no inertia since there is no mass, and mass is a measure of inertia. If this is true, does it also mean that gluons (also mass-less) also travel at (and only) the speed of light? Daisey
  19. daisey

    Electric Attractions

    I am reading Kenneth W. Ford's book entitled "The Quantum World". On page 22 under the introduction section to Charge, he talks about how charges lead to pairing. In that paragraph he states... "The hydrogen atom...consists of an electron and a proton held together by electrical attraction...
  20. daisey

    Neutrino has so little mass

    Hello All, I have read that because the Neutrino has so little mass, and because it is not affected by the Electromagnetic Force that it can travel through light years of solid lead. The photon is also mass-less, I believe. Why can it not do the same as neutrinos? I understand the photon...
  21. daisey

    Photons and Double Slit Experiment

    I read that quantum particles (like photons) travel as waves of probability, but when they encounter other quantum particles, the probability waves break down, and the photons assume properties of particles. An example given of this is: if you fire a single photon from point A, to a point B...
  22. daisey

    Does Matter Really Exist?

    My question is: Does Matter Really Exist? First of all, because I am not a physics student, my use of the term "Matter" in the above question might not be correct. By "Matter", I mean something that is physically real, has size and shape (three dimensions), and is solid. I enjoy reading...
  23. daisey

    Force Carriers - How do they work?

    Hello everyone! :smile: I am a new member, and this is my first post. I am a engineer by training, but I have always enjoyed physics. I have been reading a number of books lately about Quantum Physics, and there are a number of things I still don't understand. But there is one question...
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