Why is it light with white curtains?

[Usarka]

At school i was taught that white reflected all the coloured light. It was the "all" colour.

Black on the other hand didnt reflect nuttin'. Nuttin' at all.

So why does all the sunlight come through white curtains while black curtains leave the room nice and dark???????

If i could be arsed i'd open a new browser tab and go to google. but i cant so enlighten me (bahahahahaha)

Yes I picked the wrong day to give up sniffing glue.......

[NighthawkNZ]

At school i was taught that white reflected all the coloured light. It was the "all" colour.

Black on the other hand didnt reflect nuttin'. Nuttin' at all.

So why does all the sunlight come through white curtains while black curtains leave the room nice and dark???????


because its a fabric not a solid, and lets the light pass through the gaps in the fabric... Anything solid will reflect including black, (you still get a glare off a matt black object showing it is reflecting light, its just some reflect more than others. :blink:

[Usarka]

But the curtains are made out of the same fabric. the black ones let less light through.

:mellow:

[Drum]

Are you sure? Or is it just that the light getting through is a different color?

[Hitcher]

More worryingly, is light a particle or a wave?

[NighthawkNZ]

Are you sure? Or is it just that the light getting through is a different color?

That would be most likely :) or somewhere along thoughs lines

[Usarka]

Black light? :shit:

man i picked the wrong day to give up magic mushrooms


More worryingly, is light a particle or a wave?

The black curtains are "wavey". ergo they must be at the right wavelength to cancel out the light wave! particle schmarticle.

[FlangMasterJ]

More worryingly, is light a particle or a wave?

With the development of quantum mechanics in the 20th century came the decision that it's both! Light can act like a particle and a wave and the same time. We just see different aspects of its nature at different times. If this at all seems strange, don't worry. Quantum physics is confusing to most people, even to the people who invented it!

[McJim]

More worryingly, is light a particle or a wave?

:spudwave: 's a photon :spudwave:

[Usarka]

With the development of quantum mechanics in the 20th century came the decision that it's both! Light can act like a particle and a wave and the same time. We just see different aspects of its nature at different times. If this at all seems strange, don't worry. Quantum physics is confusing to most people, even to the people who invented it!

That would explain why some light gets through the wavey black curtains!

where did that cat come from?

[Big Dave]

I'll never be over Iwo Jima.

[McJim]

So why does all the sunlight come through white curtains while black curtains leave the room nice and dark???????

Coz the black absorbed more light on the way through

[NighthawkNZ]

More worryingly, is light a particle or a wave?

Light rides on a particle wave called taceons which makes it visible light and visible light waves are the only electromagnetic waves we can see. We see these waves as the colors of the rainbow. Each color has a different wavelength. Red has the longest wavelength and violet has the shortest wavelength. When all the waves are seen together, they make white light.


Light is a form of energy visible to the human eye that is radiated by moving charged particles. There are many unanswered questions about light. Light is very hard to study due to its high speed. One major question about light is the uncertainty of whether light is a wave or whether it is a particle. The is some evidence pointing in both directions but no conclusive proof confirms that it can be classified as either one. Scientists have learned through experimentation that light behaves like a particle at times, and like a wave at other times. Whenever light acts like a particle, we called the particles that make up the light either a photon or quantum. In 1900, Max Planck proposed the existence of a light quantum, a finite packet of energy which is a photon.

[MisterD]

Quantum physics is confusing to most people, even to the people who invented it!

F-ing tell me about it, probably the only course I never missed a lecture of, had perfect notes for and yet still gives me total brain-ache....atomic physics was a piece of cake in comparison

But getting back to Usaka's original question - you also need to consider the effects of absorbtion

[NighthawkNZ]

But getting back to Usaka's original question - you also need to consider the effects of absorbtion

either that or take off the sunnies... :crazy:

[Coyote]

With the development of quantum mechanics in the 20th century came the decision that it's both! Light can act like a particle and a wave and the same time. We just see different aspects of its nature at different times. If this at all seems strange, don't worry. Quantum physics is confusing to most people, even to the people who invented it!
Technically, it isn't both. It just has properties of both, but isn't one or the other. So that funny haired dude decided that they were little packets of energy, aka photons.

Pity I didn't get university entrance so I could study quantum physics further.

[Skunk]

So why does all the sunlight come through white curtains while black curtains leave the room nice and dark?
The white curtain will reflect ALL available light, whereas the black curtain won't. So with the white curtain you get reflected and transmitted light and the black curtain only gives transmitted light.

[NighthawkNZ]

The white curtain will reflect ALL available light, whereas the black curtain won't. So with the white curtain you get reflected and transmitted light and the black curtain only gives transmitted light.

Also while the white is reflecting the light some of that light is being reflected in throught the stitching etc... giving more visual light inside, while the same light on the black may be absorbed giving a darker appearance.

[The Pastor]

to fix this problem you first must apply the soultion.

Try reversing the flux capasitor's polarity, it worked for me, only after i checked the tyre pressures tho!

[Usarka]

The white curtain will reflect ALL available light, whereas the black curtain won't. So with the white curtain you get reflected and transmitted light and the black curtain only gives transmitted light.

What am i, a light bulb???? :eek:

[paturoa]

So what to you particle and wave pundits have to say about diffraction grates?

I Like the multiverse theory where Hondas aren't ghey and white curtains let in white light.

[homer]

so hows this work then

ok
so white reflects all available light ok
and black reflects less light ok

so how come i dont see my head light in the day time on the road which is a dark colour ..."because it reflects not a lot of light "?

or

How come at night on the back roads when theres no light i see everything with my head light on

and if its all dark at night then i should see anything except the road markers or signs which of course reflect.
:wacko:

[Skyryder]

At school i was taught that white reflected all the coloured light. It was the "all" colour.

Black on the other hand didnt reflect nuttin'. Nuttin' at all.

So why does all the sunlight come through white curtains while black curtains leave the room nice and dark???????

If i could be arsed i'd open a new browser tab and go to google. but i cant so enlighten me (bahahahahaha)

Yes I picked the wrong day to give up sniffing glue.......


It's not about reflection but absorption. The white curtains do not absorb the light so the room stays light the black curtains absorb the the light and so the room is darker.

[homer]

It's not about reflection but absorption. The white curtains do not absorb the light so the room stays light the black curtains absorb the the light and so the room is darker.

This i also know myself your quite correct
but explain my post in this thread

[Finn]

More worryingly, is light a particle or a wave?

Not another fucking waving thread!

[homer]

light cant be "unless your in space on the edge of a black hole " waves .
light dosnt bend unless the stated above happens
its definately in lines
but they do spread so a torch beam gets wider
as a lazer does get wider as well but not the same amount

[Big Dave]

[Wheels of Fire - In the Studio:]
In the white room with black curtains near the station.
Black-roof country, no gold pavements, tired starlings.
Silver horses run down moonbeams in your dark eyes.
Dawn-light smiles on you leaving, my contentment.
I'll wait in this place where the sun never shines;
Wait in this place where the shadows run from themselves.
You said no strings could secure you at the station.
Platform ticket, restless diesels, goodbye windows.
I walked into such a sad time at the station.
As I walked out, felt my own need just beginning.
I'll wait in the queue when the trains come back;
Lie with you where the shadows run from themselves.
At the party she was kindness in the hard crowd.
Consolation for the old wound now forgotten.
Yellow tigers crouched in jungles in her dark eyes.
She's just dressing, goodbye windows, tired starlings.
I'll sleep in this place with the lonely crowd;
Lie in the dark where the shadows run from themselves.

[Live Cream Vol. 2:]

Ah, Ah, Ah, Ah
Ah, Ah, Ah, Ah, Ah

In the white room with black curtains near the station.
Black-roof country, no gold pavements, tired starlings.
Silver horses run down moonbeams in your dark eyes.
She's just dressing, goodbye windows, tired starlings.
And I'll wait in this place where the sun never shines;
Wait in this place where the shadows run from themselves.
You said no strings could secure you at the station.
Platform ticket, restless diesels, goodbye windows.
As I walked in such a bad time at the station.
As I walked out, felt my own needs just beginning.
And I'll wait in the queue when the trains come back;
Lie with you where the shadows run from themselves.

Ah, Ah, Ah, Ah
Ah, Ah, Ah, Ah, Ah

At the party she was kindness in the hard crowd.
Consolation for the old wound now forgovern.
Yellow tigers crouched in jungles in her dark eyes.
She's just dressing, goodbye windows, tired starlings.

And I'll wait in this place where the sun never shines;
Lie in the dark where the shadows run from themselves.

Ah, Ah, Ah, Ah
Ah, Ah, Ah, Ah, Ah

[Usarka]

I see a red door and I want it painted black
No colors anymore I want them to turn black
I see the girls walk by dressed in their summer clothes
I have to turn my head until my darkness goes
Hmm, hmm, hmm,...
I wanna see it painted, painted black
Black as night, black as coal
I wanna see the sun blotted out from the sky
I wanna see it painted, painted, painted, painted black

[Winston001]

Light rides on a particle wave which makes it visible light and visible light waves are the only electromagnetic waves we can see. We see these waves as the colors of the rainbow. Each color has a different wavelength. Red has the longest wavelength and violet has the shortest wavelength. When all the waves are seen together, they make white light.

Light is a form of energy visible to the human eye that is radiated by moving charged particles. There are many unanswered questions about light. Light is very hard to study due to its high speed. One major question about light is the uncertainty of whether light is a wave or whether it is a particle. There is some evidence pointing in both directions but no conclusive proof confirms that it can be classified as either one. Scientists have learned through experimentation that light behaves like a particle at times, and like a wave at other times. Whenever light acts like a particle, we called the particles that make up the light either a photon or quantum. In 1900, Max Planck proposed the existence of a light quantum, a finite packet of energy which is a photon.

Good post - however it is quanta - from which we get quantum mechanics. Max Planck is regarded as the father but I think there was another German who did the seminal work 20 years earlier.

As for light, it is wave/particle duality meaning that light exists both as a particle (photon) and a wave of energy (quanta) at the same time. However you'll only detect one state upon observation. A photon has energy but no mass - go figure. :bash:

Somebody said light was a charged particle - I thought photons were uncharged?

Can anyone explain the "absorption"? I know it happens but how? Are black curtains low energy? Sort of a frozen value of the universe of curtains?

Sheesh, no wonder Schroedinger's Cat went off to an alternative universe.

[pzkpfw]

light cant be "unless your in space on the edge of a black hole " waves .
light dosnt bend unless the stated above happens
its definately in lines


How do you explain the as-predicted apparent shift of distant star when their light gets bent "around" another star in-between?

How do you explain the double-slit interference pattern experiment?



but they do spread so a torch beam gets wider
as a lazer does get wider as well but not the same amount

No, that's just individual rays exiting the laser at not-quite the same angle. There is no individual light ray spreading.

[homer]

How do you explain the as-predicted apparent shift of distant star when their light gets bent "around" another star in-between?

How do you explain the double-slit interference pattern experiment?




No, that's just individual rays exiting the laser at not-quite the same angle. There is no individual light ray spreading.

oh cool
even i can learned something
i had no idea really other than the absorbsion thingy



So what about the post i had about the headlight on my wheels
at night etc

[Usarka]

If light is a particle and is absorbed into the black curtains, will they all fall out when i beat them with a broom handle???

[nodrog]

Dude, just get blinds!

[Usarka]

Dude, just get blinds!

Blinds :lol:

[Skyryder]

More worryingly, is light a particle or a wave?

Light is made up of photons. Wave is frequancey But you knew that:buggerd:

Skyryder

[Finn]

Light is made up of photons. Wave is frequancey But you knew that:buggerd:

Skyryder

Completely incorrect... but you knew that.

[Skyryder]

light cant be "unless your in space on the edge of a black hole " waves .
light dosnt bend unless the stated above happens
its definately in lines
but they do spread so a torch beam gets wider
as a lazer does get wider as well but not the same amount

Gravity can bend light. That's been proven. The difference between lazer and a torch is the way the photons are dispersed. Torch the photons are dispersed randomly hence the spread of light the lazer the photons are paralell to each other and remain that way regardless of distance.

Skyryder

[Skyryder]

Completely incorrect... but you knew that.

Not when I went to school. Never understood chemestry but physics...............??

A photon is the elementary particle that carries electromagnetic radiation. The classification of EM is determined by the frequency(wavelength) i.e gamma rays, x rays micro waves, visible light etc.

Now 'you' know that. :whocares:

Skyryder

[Skyryder]

If light is a particle and is absorbed into the black curtains, will they all fall out when i beat them with a broom handle???

Only with a white broom handle. Use a black one and all that will happen is the light will travel from the curtain into the black handle. :argh:

Skyryder

[Skyryder]

Technically, it isn't both. It just has properties of both, but isn't one or the other. So that funny haired dude decided that they were little packets of energy, aka photons.


That's right.

SDkyryder

[MisterD]

The difference between lazer and a torch is the way the photons are dispersed. Torch the photons are dispersed randomly hence the spread of light the lazer the photons are paralell to each other and remain that way regardless of distance.




Wrong, I'm afraid. Laser is an acronym: Light Amplification (by) Stimulating Emission (of) Radiation.

The difference between a laser, and a torch is that a torch creates light by heating up a wire in a vacuum (a bulb) and you get a spread of wavelengths through the visible spectrum and into the Infra-red (aka heat).

A laser gives you one wavelength only, which can be anywhere in the spectrum from UV through to IR...it also works with other parts of the Electromagnetic spectrum, but then you have a Maser (M originally from "microwave").

To work correctly a laser cavity needs mirrors at each end to contain the amplification effect, with one of them being not quite 100% reflective to allow your beam to escape. It is these mirrors that condition the output from a traditional gas laser to be a collimated beam, however a diode laser has an output which diverges (at different angles, in parallel and perpendicular planes) so you have an elliptical "spot" which gets larger as you get further away from the device. Diode lasers (as used with optical fibres) therefore have external lenses to "launch" light into the fibre.

[Hitcher]

Light with white curtains...

Shouldn't that be Knights in White Satin? Or is that a bit moody and blue for a Friday afternoon?

[Bass]

If light is a particle and is absorbed into the black curtains, will they all fall out when i beat them with a broom handle???

Yes.
Yes they will, but use a long handle and stand well back.
Otherwise you will be blinded by the sudden flash (unless you beat gently of course)

[Bass]

Good post - however it is quanta - from which we get quantum mechanics. Max Planck is regarded as the father but I think there was another German who did the seminal work 20 years earlier.

As for light, it is wave/particle duality meaning that light exists both as a particle (photon) and a wave of energy (quanta) at the same time. However you'll only detect one state upon observation. A photon has energy but no mass - go figure. :bash:

Somebody said light was a charged particle - I thought photons were uncharged?

Can anyone explain the "absorption"? I know it happens but how? Are black curtains low energy? Sort of a frozen value of the universe of curtains?

Sheesh, no wonder Schroedinger's Cat went off to an alternative universe.

If you go a bit nuts, you can apply Planck's work to anything that moves and so calculate a wavelength. For example, a well hit golf ball has a wavelength of about 1.5 km as I recall. I have no idea how to build a diffraction grating for golf balls however, but I believe the wave properties are observable if you have sensitive enough equipment.
This of course explains why Tiger is a better golfer than I am.
He simply has a more expensive diffraction grating.

[Hitcher]

If you go a bit nuts, you can apply Planck's work to anything that moves and so calculate a wavelength.

I thought Planck's constant was about density i.e. as thick as two short plancks?

[homer]

I thought Planck's constant was about density i.e. as thick as two short plancks?

I always thought it was a 4 by 2

[Winston001]

Gravity can bend light. That's been proven.

Einstein predicted this and it was proven by the observation of Mercury orbiting from behind the sun. According to Newton, Mercury should have appeared at a certain moment (classical physics) but it was observed early ie. the light rays from the planet were bent by the Sun's gravitational field and astronomers could see it before it actually rounded the Sun. Quantum physics.


The difference between laser and a torch is the way the photons are dispersed. Torch the photons are dispersed randomly hence the spread of light the lazer the photons are parallel to each other and remain that way regardless of distance.

Skyryder

The difference is that a laser projects coherent light where all of the rays are polarised and moving in one direction. No laser is perfect and there is dispersal but they can hit the Moon with a laser and get a reflection.

A torch on the other hand just produces random photons (light) which go their own sweet way except the reflector tries to bounce them in generally the same direction. It works for a short distance.

[Big Dave]

Coz the black absorbed more light on the way through

Wouldn't that be sine?

[Hitcher]

Wouldn't that be sine?

Now you're off on a tangent.