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When the word light is mentioned what comes into your mind?

  1. Jun 29, 2013 #1
    When the word "light" is mentioned what comes into your mind?

    When the word "light" is mentioned what comes into your mind? Not only the basic definition, list everything you can think of. No need to explain.

    The purpose behind this is I'm creating a massive mind map and want to make sure I get everything included.

    Let's try and keep this post as an excellent reference for people wanting to know what light is and what's associated with light :)

    Good luck
  2. jcsd
  3. Jun 29, 2013 #2


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    What light is:

    not heavy
    type of beer or soft drink
    kind of food that doesn't make one fat
    what to do to your barbeque when it's time to cook (ignite)
    kind of person who thinks in shallow ideas (light-weight thinker)
  4. Jun 29, 2013 #3
    ^ I guess the above is enough for non-science definitions.

    Can we get some real science definitions going? :D
  5. Jun 29, 2013 #4


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    A massive mind map of something that is massless? :confused:

    (Cue one of our ever-popular debates about "rest mass / invariant mass" versus "relativistic mass." :rolleyes:)
  6. Jun 30, 2013 #5


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    Gentlemen prefer blondes because where there's light there's heat.
  7. Jun 30, 2013 #6
    Light has dual nature, diffraction and interference, i.e. which is wave and particle nature.

    Its a electromagnetic wave by Bohr.

    PM for more help
  8. Jun 30, 2013 #7


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    light is something which gives us the sence of sight, having dual nature, a kind of radiation, a energy, which shows many phenomenas like differaction, interference, reflaction, scattering etc etc
  9. Jun 30, 2013 #8


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    Photons, aka electromagnetic radiation.
  10. Jun 30, 2013 #9
    If you want a scientific definition, "light" is radiation and is just that part of the electromagnetic (EM) radiation spectrum which is naturally visible to humans. The term also may include the lower infrared frequencies and the higher ultraviolet frequencies that are not visible. The only difference between low frequency waves like radio waves, visible light and high frequency waves such as gamma radiation is the inversely related frequency/wave length. Long waves mean low frequency, short waves mean high frequency. All EM radiation travels at the "speed of light" in a vacuum. The energy of any EM radiation is a direct function of its frequency.
    Last edited: Jun 30, 2013
  11. Jun 30, 2013 #10
    Dark because "all experiments on light must be done in the dark". Was it Goethe who said something like that?
  12. Jun 30, 2013 #11


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    Is that the same guy from "pride Goethe before a fall", or someone else?
  13. Jun 30, 2013 #12


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    When some bast--d cheats me out of money i am light in the pocket.
  14. Jun 30, 2013 #13
    Doesn't sound like it. So you may as well lighten up and have a lite beer.
  15. Jun 30, 2013 #14


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    That light is such a small slice of the entire electromagnetic spectrum
  16. Jun 30, 2013 #15


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    Hence the name. A larger slice would be heavy.
  17. Jun 30, 2013 #16
    Black body spectrum vs. Spectral lines

    Light absorption of chlorophyl making life possible.
  18. Jun 30, 2013 #17
    I need to get round to replacing the blown bulbs in my kitchen.
  19. Jun 30, 2013 #18


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    I think of coca-cola light (but in my brain it's "coca light"), also known as Diet Coke in the USA.
  20. Jun 30, 2013 #19
    The first thing that comes to mind is photons and then time. I am always impressed that when we look at stars we see light that came from the past in the present. This then leads me to think about worldlines and light cones.
  21. Jun 30, 2013 #20
    This is really cute :biggrin: lol
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