Notices
Results 1 to 7 of 7

Thread: Different sources of lightss.

  1. #1 Different sources of lightss. 
    New Member
    Join Date
    Jun 2006
    Posts
    2
    Hello. For my exams this year, I am stuck on a certain subject in my review. I need to know how fluorescent, incandescent, phosphorescence, chemicoluminescence, and bioluminescence lights are produced. Im only in grade 8, so the less complicated explination would be great. I am in french immersion, so if i could get it explained in english, and french afterwards that would be terrific! :-D


    PLEASEEE HELP MEEEE!!! I DONT WANT TO FAIL MY EXAMM!


    Brittany_
    Reply With Quote  
     

  2.  
     

  3. #2  
    New Member
    Join Date
    Jun 2006
    Posts
    2
    I need help you guyss, if im not in the right part of the forums than tell me. just pleaseee HELP MEE!


    Brittany_
    Reply With Quote  
     

  4. #3  
    Forum Junior Lucifer's Avatar
    Join Date
    Jan 2006
    Location
    Close to 290125001
    Posts
    223
    Now this will sound pretty obvious... but, have you tried the Wikipedia? If you get stuck with the stuff there, you can just come here and ask for some help understanding concepts or the meaning of technicisms. What people won't usually do is "do your homework" unless they find it amusing... You would be amazed to see how many people comes here with a "please do my homework" attitude. Nothing personal, but in the world of Internet and Wikipedia, most students should be more able to help themselves than ever before. Nobody expects you to wade through kilograms of bulky encyclopaedia thomes and dozens of printed pages, but that's exactly what old-timers had to do.
    “If the misery of the poor be caused not by the laws of nature, but by our institutions, great is our sin.” -Charles Darwin
    Reply With Quote  
     

  5. #4  
    Universal Mind John Galt's Avatar
    Join Date
    Jul 2005
    Posts
    14,169
    As Lucifer said, some people will answer the question to amuse themselves:

    Fluorescent:substances that absorb light at one wavelength and emit it at another.

    Incandescence: substances that emit light because they have been heated. Electrons are excited to a higher energy state. When they drop back to a lower level a photon is emitted.

    Phosphorescence: this is similar to flourescence, but the light is not emitted immediately.

    Chemicoluminescence: this is the emission of light by a chemical reaction.

    Bioluminescence: this is chemicoluminescence occuring in a living organism.
    Reply With Quote  
     

  6. #5  
    Forum Professor Pendragon's Avatar
    Join Date
    Jan 2005
    Location
    Nederland
    Posts
    1,085
    I've always wondered how glow-in-the-dark objects work. I guess they fall in the category 'fluorescent', but is it true that they can actually amplify the light they recieve? Or do they turn a wavelength humans can't see into a wavelength we can see?
    Reply With Quote  
     

  7. #6  
    Forum Junior Lucifer's Avatar
    Join Date
    Jan 2006
    Location
    Close to 290125001
    Posts
    223
    Quote Originally Posted by Pendragon
    I've always wondered how glow-in-the-dark objects work. I guess they fall in the category 'fluorescent', but is it true that they can actually amplify the light they recieve? Or do they turn a wavelength humans can't see into a wavelength we can see?
    They are phosphorecent, as a fluorescent object only emits light while it is absorbing it (takes one wavelength, like UV, and emits another, like visilbe light). Phosphorescent objects emit energy they have stored while exposed to the light.
    “If the misery of the poor be caused not by the laws of nature, but by our institutions, great is our sin.” -Charles Darwin
    Reply With Quote  
     

  8. #7  
    Forum Professor Pendragon's Avatar
    Join Date
    Jan 2005
    Location
    Nederland
    Posts
    1,085
    interesting, so if you keep a glow-in-the-dark object in a dark room for a long time it will stop emitting light at some point? I'm gonna try it out
    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
  •