Notices
Results 1 to 11 of 11

Thread: Flux: A hypothetical argument.

  1. #1 Flux: A hypothetical argument. 
    Forum Professor leohopkins's Avatar
    Join Date
    Dec 2006
    Location
    Dulwich, London, England
    Posts
    1,418
    Okay, try to imagine this:

    A perfect sphere of any certain size; the inside of the sphere's surface is mirrored everwhere.

    Now, in the dead centre lies a blob of plasma, radiating its light out constantly.

    The light will immediately bounce off the mirrored wall and head back towards the blob of plasma; only as the plasma is radiating light, it cannot be absored.

    What happens next ?


    The hand of time rested on the half-hour mark, and all along that old front line of the English there came a whistling and a crying. The men of the first wave climbed up the parapets, in tumult, darkness, and the presence of death, and having done with all pleasant things, advanced across No Man's Land to begin the Battle of the Somme. - Poet John Masefield.

    www.leohopkins.com
    Reply With Quote  
     

  2.  
     

  3. #2  
    Guest
    I'll tell you, this [as a hypothetical question] gets moved to Psuedo Science. (from Physics). - The globe starts to warm up as the photons are eventually all converted to ifrared radiation absoebed by the material of the globe.


    Reply With Quote  
     

  4. #3  
    Forum Ph.D. william's Avatar
    Join Date
    Jun 2006
    Location
    Wherever I go, there I am
    Posts
    935
    As the blob radiates, what is really happening is that electrons from the atoms in the blob are moving from an excited state to a state of lower energy. Thus, that electron that emitted the photon is now free to absorb another photon of that exact wavelength. I don't see a problem.

    Cheers,
    william
    "... the polhode rolls without slipping on the herpolhode lying in the invariable plane."
    ~Footnote in Goldstein's Mechanics, 3rd ed. p. 202
    Reply With Quote  
     

  5. #4  
    Forum Professor leohopkins's Avatar
    Join Date
    Dec 2006
    Location
    Dulwich, London, England
    Posts
    1,418
    Quote Originally Posted by Megabrain
    I'll tell you, this [as a hypothetical question] gets moved to Psuedo Science. (from Physics). - The globe starts to warm up as the photons are eventually all converted to ifrared radiation absoebed by the material of the globe.
    How are they converted to infra-red and why ?
    The hand of time rested on the half-hour mark, and all along that old front line of the English there came a whistling and a crying. The men of the first wave climbed up the parapets, in tumult, darkness, and the presence of death, and having done with all pleasant things, advanced across No Man's Land to begin the Battle of the Somme. - Poet John Masefield.

    www.leohopkins.com
    Reply With Quote  
     

  6. #5  
    Guest
    The subject you want to read up on is "The transformation of light into heat in solids' as to 'why' - well observation suggests it does, and since we did not set the laws of the universe who can say?.
    Reply With Quote  
     

  7. #6  
    Forum Professor wallaby's Avatar
    Join Date
    Jul 2005
    Location
    Australia
    Posts
    1,521
    what if the inside surface was a shiny silver, i heard somewhere once apon a time that materials with a shiny silver coat had the tendancy to reflect infra-red.
    Reply With Quote  
     

  8. #7  
    Guest
    Well one of two things is/are going to happen,

    1) all the energy is contained within the globe, and just keeps rising, the energy becomes more and more dense - infinitely.

    2) The globe (however reflective) will absorb photons, heat will be generated, spread to the outer surface of the globe, be radiated as heat, as the globe temp rises it will radiate more and more heat until this is equal to the energy produced by the plasma - at which point 'thermal equalibrium' will establish itself.

    Now, which would you put your money on?
    Reply With Quote  
     

  9. #8 Yes.... 
    Forum Professor leohopkins's Avatar
    Join Date
    Dec 2006
    Location
    Dulwich, London, England
    Posts
    1,418
    Yes you are right;

    I just heated up a mirror on my stove. the other side got hot.

    hmmm...........

    What is the direct opposite of infra-red ? In frequency ?
    The hand of time rested on the half-hour mark, and all along that old front line of the English there came a whistling and a crying. The men of the first wave climbed up the parapets, in tumult, darkness, and the presence of death, and having done with all pleasant things, advanced across No Man's Land to begin the Battle of the Somme. - Poet John Masefield.

    www.leohopkins.com
    Reply With Quote  
     

  10. #9  
    Guest
    Er - that is a meaningless question - it's like what's the opposite of '2' - although one might in this case say -2 that does not work with frequency, it has only positive values.
    Reply With Quote  
     

  11. #10 Alright 
    Forum Professor leohopkins's Avatar
    Join Date
    Dec 2006
    Location
    Dulwich, London, England
    Posts
    1,418
    I was thinking more along the lines of peaks and troughs in the wavelength. something which could possibly help to "cancel out" the infra-red. but I have just realised as im typing this that as photon's do not inter-act with each other im talking a load of...........
    The hand of time rested on the half-hour mark, and all along that old front line of the English there came a whistling and a crying. The men of the first wave climbed up the parapets, in tumult, darkness, and the presence of death, and having done with all pleasant things, advanced across No Man's Land to begin the Battle of the Somme. - Poet John Masefield.

    www.leohopkins.com
    Reply With Quote  
     

  12. #11  
    Guest
    er - bollocks?
    Reply With Quote  
     

Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •