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ITT >> can YOU answer my question?

phatboy123 Avatar
7y, 11m agoPosted 7 years, 11 months ago
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?............
phatboy123 Avatar
7y, 11m agoPosted 7 years, 11 months ago
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#1
tree fiddy
banned#2
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.
1 Like #3
black gerbil1;3745480
tree fiddy


is being original not kewl anymore?
#4
:thinking: Yes :santa:

But you would have to be quick as it's pretty nippy stuff
299,792,458 metres per second
#5
imranmaz;3745494
NO you wouldnt.


explain plz
#6
How did you get hold of my shiny light sphere?
1 Like #7
Light needs a source. Since there is no source of light inside the sphere, no light can be emitted from inside it.
#8
mbgringo;3745514
How did you get hold of my shiny light sphere?


sry i only borrowed it :-D
banned#9
Predikuesi
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
1 Like #10
phatboy123
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 . . . .
#11
ouch that makes my head hurt
#12
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
#13
mbgringo;3745550
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:
#14
imranmaz;3745547
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 :)
#15
Light Is A Wave Like A Radio Wave So When You Kill The Torch Its Like Killing A Radio Transmitter
banned#16
Predikuesi
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
#17
The argument can be easily solved. Put a miniture camera in the sphere and let it record the evidence :)
#18
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#19
Predikuesi
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.
#20
phatboy123
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 . . .
#21
Predikuesi;3745661
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?
#22
raptorcigs;3745643
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:
#23
imranmaz
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.
#24
got any questions on sport?
too difficult for me
#25
Benjimoron;3745695
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]
#26
happy donkey
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).
#27
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.
#28
Anyone know a particle [FONT=Calibri]Physicist :thinking:[/FONT]

:santa:
#29
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?
1 Like #30
http://upload.wikimedia.org/math/0/2/3/0238dd62774be31293f056085ca83228.png:thumbsup::whistling:
1 Like #31
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?
#32
Shengis;3745779
http://upload.wikimedia.org/math/0/2/3/0238dd62774be31293f056085ca83228.png:thumbsup::whistling:


The most sensible answer yet:thumbsup::-D
1 Like #33
Benjimoron;3745755
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:
#34
Predikuesi
The most sensible answer yet:thumbsup::-D


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

As Artonox said, Quantum Mechanics.
1 Like #35
Mirrors are generally over 99% reflective btw.
#36
Shengis;3745779
http://upload.wikimedia.org/math/0/2/3/0238dd62774be31293f056085ca83228.png:thumbsup::whistling:

LoL :santa:
#37
bigsky


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!)
#38
happy donkey
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.
#39
Shengis;3745800
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
#40
Artonox
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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