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    ITT >> can YOU answer my question?

    If I were to create a sphere that had a reflective (mirror like surface) all over the inside of the sphere. And I opened the sphere and shone a very bright light inside, and kept this up while closing it to create a seamless seal. If I were to open the sphere again in a pitch black room, would I see the light I shone into it not long ago emit from the sphere? If even it was a quick flash?............

    88 Comments

    tree fiddy

    Banned

    NO you wouldnt.

    the speed of light is too quick for you to suggest that it would keep reflecting around in there till you broke the reflective seal.

    Original Poster

    black gerbil1;3745480

    tree fiddy



    is being original not kewl anymore?

    :thinking: Yes :santa:

    But you would have to be quick as it's pretty nippy stuff
    299,792,458 metres per second

    Original Poster

    imranmaz;3745494

    NO you wouldnt.



    explain plz

    How did you get hold of my shiny light sphere?

    Light needs a source. Since there is no source of light inside the sphere, no light can be emitted from inside it.

    Original Poster

    mbgringo;3745514

    How did you get hold of my shiny light sphere?



    sry i only borrowed it :-D

    Banned

    Predikuesi;3745522

    Light needs a source. Since there is no source of light inside the … Light needs a source. Since there is no source of light inside the sphere, no light can be emitted from inside it.



    I think the point that he is making is that the distance between the two sides of the sphere would mean that once light has travelled to one side it will be on its way to be reflected on the otherside hence why he expects there to be a little flash when he breaks the sphere open.

    This wont work as the speed of light would make the distance negligible

    phatboy123;3745532

    sry i only borrowed it :-D



    Its ok, just make sure you switch it off when you are done, don't leave it on standby, carbon footprint and that . . . .

    ouch that makes my head hurt

    Since light travels as either wave or particle form the theoretical answer must be yes

    If a star emits light it takes time to get here, the distances involved are tiny but it still has to travel

    Original Poster

    mbgringo;3745550

    Its ok, just make sure you switch it off when you are done, don't leave … Its ok, just make sure you switch it off when you are done, don't leave it on standby, carbon footprint and that . . . .



    there is a small scratch though,
    here is some rep to make up for your losses :thumbsup:

    imranmaz;3745547

    I think the point that he is making is that the distance between the two … I think the point that he is making is that the distance between the two sides of the sphere would mean that once light has travelled to one side it will be on its way to be reflected on the otherside hence why he expects there to be a little flash when he breaks the sphere open.This wont work as the speed of light would make the distance negligible



    I understood that, but since the original light source was outside the sphere any reflective light would disappear almost instantly, thus no light. Opening the sphere would allow outside light to enter it, so it would be impossible to tell if any of the supposed charge was still there. Light needs energy. No energy, no light.


    The argument can be easily solved. Put a miniture camera in the sphere and let it record the evidence

    Light Is A Wave Like A Radio Wave So When You Kill The Torch Its Like Killing A Radio Transmitter

    Banned

    Predikuesi;3745597

    I understood that, but since the original light source was outside the … I understood that, but since the original light source was outside the sphere any reflective light would disappear almost instantly, thus no light. Opening the sphere would allow outside light to enter it, so it would be impossible to tell if any of the supposed charge was still there. Light needs energy. No energy, no light.



    if he could seal the sphere quick enough for the light from the light source not to have reached the inside surface of the sphere then the light could be trapped inside. but the practicalities is that the distance between the two sides of the sphere would be too short for the light to keep bouncing around inside. also there could not physically be such a surface and energy would be lost due to impurities in the reflective surface thus transferring energy as heat to the inner surface of the sphere

    The argument can be easily solved. Put a miniture camera in the sphere and let it record the evidence

    I dont think mirrors are perfect. They can absorb light (need proof on this bit)
    Mirrors are not like space, where light can travel indefininately

    Banned

    Predikuesi;3745597

    I understood that, but since the original light source was outside the … I understood that, but since the original light source was outside the sphere any reflective light would disappear almost instantly, thus no light. Opening the sphere would allow outside light to enter it, so it would be impossible to tell if any of the supposed charge was still there. Light needs energy. No energy, no light.The argument can be easily solved. Put a miniture camera in the sphere and let it record the evidence



    the camera would block the path of the light and stop it from reflecting indefinately.


    I think the OP is challenging us to disprove the conservation of energy. if there is no way for the split second of light inside the sphere to transfer its energy into something else then yes you would see the light flash when you opened the sphere but this is impossible in real life.

    phatboy123;3745595

    there is a small scratch though,here is some rep to make up for your … there is a small scratch though,here is some rep to make up for your losses :thumbsup:



    Why thank you, don't worry the scratch will T-cut out. I was thinkin of ebaying the sphere anyway. Fancy a dodecahedron next. 20 vertices and 30 edges represents value for money in the shape world . . .

    Original Poster

    Predikuesi;3745661

    The argument can be easily solved. Put a miniture camera in the sphere … The argument can be easily solved. Put a miniture camera in the sphere and let it record the evidence



    Would the camera not absorb the light right away?

    raptorcigs;3745643

    Light Is A Wave Like A Radio Wave So When You Kill The Torch Its Like … Light Is A Wave Like A Radio Wave So When You Kill The Torch Its Like Killing A Radio Transmitter


    It also is a particle, Photons so it also could travel :santa:

    imranmaz;3745657

    energy would be lost due to impurities in the reflective surface thus … energy would be lost due to impurities in the reflective surface thus transferring energy as heat to the inner surface of the sphere



    That's my answer, energy cannot be created or destroyed. Only transferred, the light energy would transfer to heat energy IMO.

    got any questions on sport?
    too difficult for me

    Benjimoron;3745695

    That's my answer, energy cannot be created or destroyed. Only … That's my answer, energy cannot be created or destroyed. Only transferred, the light energy would transfer to heat energy IMO.


    Now the question is, is the sphere a vacuum inside :?
    Light can exhibit properties of both ][COLOR=#002bb8]waves[/COLOR] and ][COLOR=#002bb8]particles[/COLOR] (][COLOR=#002bb8]photons[/COLOR]). This property is referred to as ][COLOR=#002bb8]wave–particle duality[/COLOR]

    happy donkey;3745723

    Now the question is, is the sphere a vacuum inside :?



    Does it matter? The light would transfer to heat via radiation (which works through a vacuum).

    phatboy123;3745682

    Would the camera not absorb the light right away?




    Yes. That's the whole point. Whatever the inside of the sphere is made of (or what it might contain) will absorb the light (should really be saying energy) almost instantly. I agree that, for a nanosecond, light might exist inside the sphere, but since it is virtually impossible to record it, there is no way to measure it. It's like saying that light still exists inside the fridge once you closed the door. It does, but it would be difficult to quantify for how long it exists.

    Anyone know a particle [FONT=Calibri]Physicist :thinking:[/FONT]

    :santa:

    Is this not like quantum mechanics?
    Anyways, im strangely thinking this:

    Imagine the sphere is so huge, it would take light 1 second to reach the other sid of the sphere (passing the centre, hence travelling via a diameter distance). So close the super plug within the second you shine the light through the hole. Would it still be trapped, even for a second?

    http://upload.wikimedia.org/math/0/2/3/0238dd62774be31293f056085ca83228.png:thumbsup::whistling:

    No flash I'm sorry to say. Wouldn't it be fun if there was?

    The problem is:

    1. You couldn't shut or open the sphere quick enough

    2. The process of reflection will be lossy so light won't just keep bouncing around inside the closed sphere

    Good question. What's next?

    Shengis;3745779

    :thumbsup::whistling:



    The most sensible answer yet:thumbsup::-D

    Benjimoron;3745755

    Does it matter? The light would transfer to heat via radiation (which … Does it matter? The light would transfer to heat via radiation (which works through a vacuum).


    Hmmm ! light travels across space in a vacuum, but it does heat stuff up that it hits, ie Mr Astronaut, so i guess you could be right :?
    :santa:

    Predikuesi;3745791

    The most sensible answer yet:thumbsup::-D



    Well the question is essentially that of Schrödinger's cat:)

    As Artonox said, Quantum Mechanics.

    Original Poster

    Mirrors are generally over 99% reflective btw.

    Shengis;3745779

    :thumbsup::whistling:


    LoL :santa:

    bigsky;3745789

    Good question. What's next?



    If you drilled a hole all the way through the earth to the other side (Australia or wherever) and then fell into the hole, how long would it take you to fall all the way through to the other side? (assuming no air resistance or hot lava in the middle of the earth!)

    happy donkey;3745798

    Hmmm ! light travels across space in a vacuum, but it does heat stuff up … Hmmm ! light travels across space in a vacuum, but it does heat stuff up that it hits, ie Mr Astronaut, so i guess you could be right :?:santa:



    If true then, if whenever light hits anything, it heats it up, then it is safe to assume that mirrors are no exception (mirrors are made of particles). Light energy converts to heat energy.

    Shengis;3745800

    Well the question is essentially that of Schrödinger's cat:)As Artonox … Well the question is essentially that of Schrödinger's cat:)As Artonox said, Quantum Mechanics.


    Poor cat :cry: or is it ok who knows, open the box quick

    Artonox;3745823

    If true then, if whenever light hits anything, it heats it up, then it is … If true then, if whenever light hits anything, it heats it up, then it is safe to assume that mirrors are no exception (mirrors are made of particles). Light energy converts to heat energy.



    Sort of, if light hits something reflective (a mirror or white coloured material) then most of the energy will be bounced back off. If it hits something black then most will be absorbed.
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