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Will a lightbulb work in a completely black room?

  • 27-10-2011 11:17PM
    #1
    Registered Users, Registered Users 2 Posts: 87 ✭✭puffin24


    As title suggests. Cant find anything on google. If a room was totally painted black with no light coming in and nothing else in it what would it look like if you turned a light on?


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Comments

  • Closed Accounts Posts: 17,689 ✭✭✭✭OutlawPete


    Of course it would work.

    Sure what good would torches be in a dark room if it didn't?


  • Registered Users, Registered Users 2 Posts: 140 ✭✭Marcus_Crassus


    Are you serious?

    It would look like a bulb hanging in the middle of a dark room..


  • Posts: 3,539 ✭✭✭ [Deleted User]


    It would look like a room painted black.

    I don't get the problem.


  • Registered Users, Registered Users 2 Posts: 2,081 ✭✭✭GetWithIt


    ?? Seriously?


  • Registered Users, Registered Users 2 Posts: 14,650 ✭✭✭✭minidazzler


    How black is black? Are you in the room? If there is anyway whatsoever to reflect light you will see something. at very least you will see the beam of light.


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  • Closed Accounts Posts: 10,808 ✭✭✭✭chin_grin


    It'd look like a black room with a light in it.


  • Registered Users, Registered Users 2 Posts: 37,308 ✭✭✭✭the_syco


    Depends on the paint, the black wall may or may not give a reflection.


  • Registered Users, Registered Users 2 Posts: 20,653 ✭✭✭✭amdublin


    Ha ha ha ha!

    This has to be the best question ever!

    And the answers are even better :)


  • Posts: 81,310 CMod ✭✭✭✭ Serenity Full Grassland




  • Registered Users, Registered Users 2 Posts: 1,663 ✭✭✭Immaculate Pasta


    Racist.


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  • Registered Users, Registered Users 2 Posts: 16,499 ✭✭✭✭DEFTLEFTHAND


    What has you asking OP?


  • Registered Users, Registered Users 2 Posts: 576 ✭✭✭Joe Exotic


    In the interests of science i reccomend you go home and try it this weekend.

    come back when you have the answer:D


  • Registered Users, Registered Users 2 Posts: 11,318 ✭✭✭✭carchaeologist


    puffin24 wrote: »
    As title suggests. Cant find anything on google. If a room was totally painted black with no light coming in and nothing else in it what would it look like if you turned a light on?

    You would see the black walls very well with the light on....


  • Closed Accounts Posts: 2,851 ✭✭✭Cill Dara Abu


    puffin24 wrote: »
    As title suggests. Cant find anything on google. If a room was totally painted black with no light coming in and nothing else in it what would it look like if you turned a light on?
    Is the tv license inspector lurking around or what?


  • Registered Users, Registered Users 2 Posts: 78,822 ✭✭✭✭Victor


    It would work (black paint won't break a lightbulb), just the room wouldn't look quite as bright as a normally painted room. It you held your hand up by the light, it would look little or no different from when you looked at your hand in another room.

    Of course, black paints tend not to be perfectly black. Gloss paint would have a shine to it.


  • Registered Users, Registered Users 2 Posts: 87 ✭✭puffin24


    Ha ha, cheers for the useful responses so far. I mean a matt paint, and not because Im planning to do it. Im not that weird. I just want to know if there is a possiblity of having a very very black room with no reflective surfaces and then what it would look like with light in it.


  • Closed Accounts Posts: 36,634 ✭✭✭✭Ruu_Old


    Black or is it very, very, very, very, very, VERY dark blue?


  • Registered Users, Registered Users 2 Posts: 4,571 ✭✭✭Aoifey!


    Ruu wrote: »
    Black or is it very, very, very, very, very, VERY dark blue?
    Well now, this changes everything.


  • Closed Accounts Posts: 7,751 ✭✭✭Saila


    no, it will be like seeing a black cat in the dark. You will see the shape the cat makes but you wont be able to see anydetail of it you will just see a shadow, now if you take it that a black cat absorbs the light of what you are looking at it with and apply the same to a room full of black [like the black cats] then no light is getting reflected so nothing can be seen in the room if the light is on and there is no natural light coming in there and the walls are painted black.


  • Registered Users, Registered Users 2 Posts: 553 ✭✭✭BASHIR


    ha ha classic


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  • Registered Users, Registered Users 2 Posts: 87 ✭✭puffin24


    Saila wrote: »
    no, it will be like seeing a black cat in the dark. You will see the shape the cat makes but you wont be able to see anydetail of it you will just see a shadow, now if you take it that a black cat absorbs the light of what you are looking at it with and apply the same to a room full of black [like the black cats] then no light is getting reflected so nothing can be seen in the room if the light is on and there is no natural light coming in there and the walls are painted black.

    See THIS is what I thought. Though I aint no physicist....or whatever things would know stuffs re this.


  • Closed Accounts Posts: 6,543 ✭✭✭JerryHandbag


    Get on the blower to Mythbusters


  • Closed Accounts Posts: 5,733 ✭✭✭oppenheimer1


    You would see the black walls very well with the light on....

    it depends on how black the black paint is. In theory if they were a black body (perfect blackness) the walls would not be visible.


  • Registered Users, Registered Users 2 Posts: 688 ✭✭✭JazzyJ


    What if it's in a black hole?


  • Closed Accounts Posts: 5,219 ✭✭✭woodoo


    Puffin pay more attention in science class :D


  • Closed Accounts Posts: 1,990 ✭✭✭JustAddWater




  • Registered Users, Registered Users 2 Posts: 7,813 ✭✭✭TPD


    If the walls were so black they reflected no light, you'd just see the bulb and yourself. Would be a bit weird really. But there isn't any paint quite black enough.


  • Registered Users, Registered Users 2 Posts: 87 ✭✭puffin24


    woodoo wrote: »
    Puffin pay more attention in science class :D
    Science is for nerds. And to answer vague questions like mine.


  • Closed Accounts Posts: 6,706 ✭✭✭Voodu Child


    If the walls were perfectly black (ie absorbs 100% of EM radiation) then you would not be able to see them. It would appear to you that you were floating in space.

    However a perfectly black material doesnt exist.


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  • Registered Users, Registered Users 2 Posts: 5,485 ✭✭✭Thrill


    The paint would have to be light absorbing. Don't know if there is such a thing though.


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