Slashdot Mirror


100th Anniversary of Quantum Physics

EricR writes "On December 14, 1900, Max Planck presented experimental results in front of the German Physical Society and announced that they could best be explained if energy exists in discrete packets, which he called "quanta." Today is the 100th birthday of Quantum Physics."

28 of 260 comments (clear)

  1. 100th? by servoled · · Score: 5, Funny

    Would it be the 102nd? Or am I missing something here.

    --
    "I have a porkchop, you have a porkchop. I have a veal, you have a veal".
    1. Re:100th? by Anonymous Coward · · Score: 5, Funny

      >Would it be the 102nd? Or am I missing something here.

      The number 100 is correct.

      Slashdot is simply very late with the news this time.

    2. Re:100th? by MrResistor · · Score: 5, Funny

      It's slashdot math. You know, it's just like how 50+2-1=49

      --
      Under capitalism man exploits man. Under communism it's the other way around.
    3. Re:100th? by grub · · Score: 5, Funny

      It's 102 in imperial years, 100 in metric years.

      --
      Trolling is a art,
    4. Re:100th? by pimpinmonk · · Score: 5, Funny

      Nah, it's correct. In the spirit of Planck they correctly accounted for the transformation from numbers to waves to particles and back.

    5. Re:100th? by Henry+V+.009 · · Score: 5, Funny

      Oh ye of little faith!

      delta E * delta t >= h-bar

      Therefore, the slashdot editors are being careful about not determining the time too precisely lest Max Planck and the German Physical Society accidently obtain an energy with an order of magnitude anywhere between a butterfly's wings and a supernova.

    6. Re:100th? by doubtless · · Score: 5, Funny

      Yes, it is the 100th anniversary, but we have problem zeroing in the exactly street address Max Planck started all this. However, scientists are pretty sure he was somewhere in Germany.

      --
      geek page at KY speaks
    7. Re:100th? by Have+Blue · · Score: 5, Funny

      Given that Slashdot time was 100 years and wall-clock time was 102 years, we can determine that Slashdot is moving at an average velocity of 2.941 x 10^8 meters per second relative to the news source. No wonder no one has time to read the article...

  2. Richard P. Feynman said... by bartash · · Score: 5, Interesting

    "I think I can safely say that nobody understands quantum mechanics."

    --
    Read Epic the first RPG novel.
    1. Re:Richard P. Feynman said... by DrLudicrous · · Score: 4, Interesting
      Einstein didn't have a problem with the discreteness of quantum mechanics. As a matter of fact, any halfway decent mathematician (physicists included) would disagree with this property- it is the result of systems that are represented with certain differential equations PLUS boundary conditions which limit the solutions to said equations. These types of systems and equations have existed for over a hundred years longer than quantum mechanics.

      What Einstein disagreed with were things like the Uncertainty Principle, the EPR paradox (If he had lived to see it), and most likely even Schrodinger's Cat. He disagreed with the assumptions that led to these conclusions. So Einstein was most definitely NOT a supporter of quantum mechanics as we now know it. Even the greatest can be mistaken.

    2. Re:Richard P. Feynman said... by grahamlee · · Score: 5, Informative
      What Einstein disagreed with were things like the Uncertainty Principle, the EPR paradox (If he had lived to see it), and most likely even Schrodinger's Cat[1]. He disagreed with the assumptions that led to these conclusions.

      I think his main problem was the idea of Universal instantaneous collapse of the wavefunction (which leads to "spooky action at a distance"[2] and God playing "dice with the Universe"). These concepts came from the Copenhagen Interpretation, and was the best way the Quantum theoreticians could think to explain the seemingly counterintuitive results of QM - it's pure philosophy and has nothing to do with the Physics.

      Of course not everyone necessarily subscribes Copenhagen now. My personal favourite explanation is the proposition popular in the 80s and in Sliders - that multiple Universes are created at each instant multiple outcomes are possible, each reflecting the different outcomes.

      So Einstein was most definitely NOT a supporter of quantum mechanics as we now know it.

      Quantum mechanics as we currently know it includes Bose-Einstein statistics describing the behaviour of systems of integer-spin particles (which leads to the concept of a Bose-Einstein condensate - a highly active area of research today); Light Amplification by Stimulated Emission of Radiation (described at the atomic scale by the Einstein coefficients); quantisation of electromagnetic radiation (proposed by Einstein); Einstein's explanation of the photoelectric effect (for which he received the Nobel prize). Stretching the boundaries a little, there are equations for the equilibrium number of charge carriers in Solid State physics which rely on the quantisation of charge in the material. These are known as the Einstein equations.

      Even the greatest can be mistaken.

      Such as when he removed lambda from his equation on the state of the Universe (his "biggest blunder", indeed :-)).

      [1]Point of order: even Schroedinger didn't believe in Schroedinger's Cat. He set it up as a thought experiment to show how absurd QM is (I mean, who could really believe in a dead/alive cat? Not him). The experiment has of course, since been done, sans cat.

      [2]He believed that the "instantaneous" collapse of the wavefunction would lead to information being propagated instantaneously throughout the Universe. Of course, the wavefunction is not a measurable quantity so this does not occur.

  3. Enrico Fermi Institute - Dec 2nd by VoidEngineer · · Score: 5, Informative

    Gotta love quantum physics...

    Check out the University of Chicago's Physics Department for all the information you could want to know about modern research in quantum physics.

    Oh, and December 2, 2002 was the 60th Anniversy of the first self-sustaining controlled release of nuclear energy

  4. boo hoo by coloth · · Score: 5, Funny

    I didn't understand the impact of uncertainty until I saw The Crying Game.

    --

    Machines take me by surprise with great frequency. -A. Turing

  5. My thoughts on the matter. by Sean+Johnson · · Score: 5, Insightful

    Of course describing energy as quanta is just a way for us to understand how things work. Anytime we discover and present a theory as to how things work in the universe we are presenting a picture or an incomplete slice of the whole (as how we understand it). Sure it helps us understand better, but we have to realize that it is not the way things work out per say (as a whole). Meandering on: A GUT theory is an admiral thing to strive for, but we must understand what it must take to come to such a comprehensive theory. All present theories will have to be thrown out of the window. They will never make cohesive integral sense incorporated into a GUT. Each time we delve further into quantumn particles we find more and more suprises. Likewise with peering into the vastness of space.
    It is all so amazing and we must realize that any theories we come up with will never be able to describe things as a whole. It is basically the universe trying to understand itself...when it already knows. Dang....now I am getting into Zen philosophy so I will jsut shut up becasue I don't know where this is leading towards.

    --
    >>>>>> Chewie, take the professor in the back and plug him into the hyperdrive.
  6. Sorry about the spelling... by VoidEngineer · · Score: 5, Informative

    Since I goofed on the last post, I'll add the obligatory links to:

    CERN
    The Enrico Fermi Institute
    Fermi National Accelerator Laboratories
    Agronne National Laboratories
    Los Alamos National Laboratories

    Yep, all the information you could want on modern Quantum Physics.

  7. Since i'm not smart enough to make a joke here by IIRCAFAIKIANAL · · Score: 4, Funny
    --
    Robots are everywhere, and they eat old people's medicine for fuel.
  8. Quantum Mechanically Speaking, by eigerface · · Score: 5, Funny

    There is a finite probability that this will be modded up to 5.

  9. Basis of all science by mnmn · · Score: 4, Interesting


    Through the wave of all the 2002-1900=100 jokes here, I would like to salute Mankinds greatest discovery, Qauntum Physics. This shows teh flexibility of the human brain, able to work with 4 dimensions (Relativity) to now (26 dimensions), and even something as strange as Quantum Mechanics, that defies our imagination and relies purely on reasoning, yet so powerful, it gave us the best of the last century's inventions, including the device you're staring at.

    Quantum Mechanics is more than the kind of Physics that allows engineers to make locomotives. Its even more than what allowed us to land on the moon. As a warmer, we get nukes and the mighty computer. This physics promises us glimpses of the time the Universe was born, the quantum computer, time travel, teleportation, and many other things we have'nt imagined yet.

    Physics has always been the foundation of knowledge, and it was replaced 100 years ago (+- 2 years). I think we're in for much bigger surprises this century.

    --
    "Give orange me give eat orange me eat orange give me eat orange give me you." -Nim Chimpsky
    1. Re:Basis of all science by the+gnat · · Score: 5, Funny

      I would like to salute Mankinds greatest discovery, Qauntum Physics. This shows teh flexibility of the human brain

      Sounds like your brain is a little too flexible right now. Go home and sleep it off, dude.

  10. Tomble answers your questions! by Tomble · · Score: 5, Funny
    Maybe I'm just sleepy, but wasn't the anniversary two years ago?
    Well, reader, that's certainly an easy mistake to make, considering the title of the story, but if you look a little more carefully at the body, it becomes clear that the title (perhaps chosen by someone else) was wrong and inaccurate in a very different way, probably only badly chosen, due to a simple misunderstanding of the facts:
    On December 14, 1900, Max Planck presented experimental results in front of the German Physical Society and announced that they could best be explained if energy exists in discrete packets, which he called "quanta". Today is the 100th birthday of Quantum Physics

    As you can doubtless see from a second look, it all fits into place that Planck's announcement, which lead to other scientists further investigating the full ramifications of the theory, was the conception of Quantum Physics as we know and love it today. Whilst the title is obviously innacurate, the observation that today is Quantum Physics' 100th birthday is clearly correct, as it is broadly accepted that models of reality have a 2 year gestation period- a similar duration to elephants, I believe.

    Sadly, though, Quantum Physics has not been too lucky in love, having had occasional brief flings with 50's icon Relativity, whom everyone would have liked to see it matched up with, but it never quite seemed to work out for them- it seems they just had too many differences.

    Although we all wish Quantum Physics well, and it seems surely impossible that such a great catch would never get married (who knows, maybe good old Q.P will be able to patch things up with Relativity after all), it shall obviously not be having any anniversaries for some time yet.

    Hope this clears everything up,
    Tomble

    --
    Be careful! New moon tonight.
  11. Public Advisory by pyth · · Score: 5, Funny
    Our teams of scientists have discovered that this article contains trace references to Quantum Mechanics.
    As such, there is a risk of discussions developing that involve people talking out of their
    completely uninformed ass. Some of the most common symptoms of Quantum Ass-Talking Syndrome (QATS) involve the following topics:
    • Philosophy - free will, determinism, subjectivity
    • Theology - god's omni-something, predestination, free will [again]
    • Science - failure of predictability

    If you feel the urge to discuss these topics, we advise that you immediately consult somebody who knows what the hell they're talking about. If further trouble develops, a dose of reality is recommended.
  12. /. submission queue by dfay · · Score: 4, Funny

    Wow, I guess that means that this is the 2-year anniversary of that story being first submitted to /. I'm glad to see it finally made it on to the front page. Congrats, EricR. :)

  13. What Planck actually discovered by CactusCritter · · Score: 5, Informative

    The wavelength distribution of blackbody radiation had been determined some (many?) years earlier. However, no one could figure out how to to explain how it could come about.

    Somehow, Planck worked out an equation which yielded that wavelength distribution quite precisely. I believe that it is correct that his model was a "what if" conjecture about energy exisiting in discrete packets.

    As discussed, the rest is history.

    53 years of passing time has dimmed my memory, but I'm pretty sure that is the story.

    1. Re:What Planck actually discovered by Anonymous Coward · · Score: 4, Informative
      wavelength distribution, while approximatedearlier than planck, wasn't known exactly. They just had some function(s) that fit the known data (ie, corrected the rayleigh-jeans ultraviolet catastrophe).


      Plank showed, by solving statistically-mechanically, a series of independent discrete quanta(estimating the photon oscillation as simple-harmonic), the allowed spectrum was consistent with the observed data.


      Lucky for him, simple harmonic oscillators have that exact energy spectra (E=hbar*omega(N+1/2)) where N is the energy-level (or quantum number) of the oscillator. Lucky guess, or insight of pure genious. No other (that i know of) systems have such an energy spectra (evenly-spaced, singly occupied). simple examples are particle-in-box and hydrogen atom.


      This method of the blackbody radiation as quantum simple-harmonic oscillators is also very nearly similar to calculating the specific heat of crystals (Einstein method for independent oscillators, but corrected by Debye for coupled oscillators up to a sharp cutoff frequency).


      This, though, ushered in new tidings, not just for pure quantum physics, but for statistical physics of quantum objects (bosons, fermions) which have different statistical distributions than classical particles (maxwell-boltzmann statistics). paved the way for solid-state physics to burgeon forth (hello transistors!!!)

  14. Birthday Party by hermescom · · Score: 4, Funny
    At Quantum Physics' 100th birthday party, a number of notable personalities were on hand.

    Republican Majority Leader, Trent Lott, made a birthday speech congratulating Quantum Physics with its 100 year anniversary, and fondly recalled when during the planning stages of the Manhattan project, scientists were considering building a weapon of mass destruction based on Quantum Physical principles.

    "I can tell you now, I wish they'd picked Quantum Physics," Lott said, "If they did, I'm sure the world as we know it would be a better place for white people to live."

  15. And he hated it by teece · · Score: 4, Interesting

    Whats ironic is that Boltzmann first came up with this idea, and Planck was one of his primary detractors. Boltzmann, despondent that nobody found his description of a probabilistic interpretation of things interesting, killed himself.

    Not long after, Planck came forward using Boltzmann's ideas. There is some evidence to show that Planck's true hope was that he would be proved wrong -- he didn't like the quanta or probability interpretation at all.

    Tim

    --
    -- Hello_World.c: 17 Errors, 31 Warnings
  16. Re:Quantum Physics -- entanglement by etcshadow · · Score: 4, Informative

    Wow... I don't even know where to start...

    "it doesn't even matter how far apart they are in the universe; they'll always do the same things at the same times no matter where they are in the universe"

    Wrong wrong wrong wrong wrong. Quantum entanglement says that the two particles *started off the same (or opposite or some such relationship of the initial states). It follows, then that if you do not *observe* either particle for quite some time, and take the two of them far distant from one another, then the instant that you *observe* the state of one particle, you immediately *know* the state of the other particle (wherever it is).

    This gives at first pass the illusion that you have gotten information at faster than the speed of light... I mean, you did just *instantaneously* learn the state of a particle far, far away, right? That's gotta mean that you communcated with that thing way over there, right? No. Not at all.

    Now, what makes this interesting is the fact that quantum mechanics tells us that if you don't *observe* either particle's state, then neither particle has actually "picked" a state yet. So, it's as though the one particle *told* the other one that "hey I was observed at state A, so you must now occupy state B". So, now it appears that information has traveled faster than the speed of light... and I won't argue that point, because last I knew better scientists than me were still duking that one out.

    However, one thing that anyone with a basic understanding of this can agree upon is the fact that there is no way to *use* the possible information transfer involved in the collapse of a wave function to TRANSMIT INFORMATION. Why? Well, there is no way to observe a wave function directly. You can only measure some operator on a wave function (like energy, position, spin), and by doing so, you collapse the wave function into an eigenfunction of that operator. However there is no way to tell whether the eigenfunction you observe is the result of *your* observation or someone elses. In other words, you can't tell if you collapsed the wave function or if someone else did, and quantum entanglement doesn't *do* anything other than pre-collapse the wave-fcuntion for you.

    --
    :Wq
    Not an editor command: Wq
  17. Chunk physics by Black+Copter+Control · · Score: 4, Interesting
    Back in the late '80s John Wheeler was at the University of Alberta. As luck would have it I was the Tech at the student Radio station who got to edit his interview. I remember two things from him. One was the quote he found in a bathroom:
    Time is nature's way of keeping everything from happening all at once.
    The other was his discription of the etymology of "quantum". Essentially it's just German for "unit" or "chunk". He figured that if Plank had been a native English speaker, we'd probably be dealing with "chunk" physics instead of "quantum" physics.
    .. Just had to share that.
    --
    OS Software is like love: The best way to make it grow is to give it away.