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Post by buckleymanor1 on May 26, 2011 16:35:56 GMT 1
No no 'white light before entering the prism is at one frequency' remember, the white light contains seven 7 visible colours [to us] en.wikipedia.org/wiki/Visible_spectrum, the prism 'breaks up' the perceived white light into its component parts. So white light is a 'fraud' remember? It's not a colour in itself, it's a combination, an homologation, a cadre of fellow travellers, multi-ethnic electromagnetic waves! StuartG This seems to be the nub of the problem that I am having and it's description as far as I can see. The white light is described as having one frequency before entering the prism. Yet once in the prism is broken into it's component parts (colours) with each different colour corresponding to a different frequency as Speaker describes. The classical explanation says there is no frequency change. How then do you start with one frequency white light and end up with seven different frequencies which you can see as colours and then say there has been no change in frequency. Totally misleading and nuts if you ask me.
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Post by speakertoanimals on May 26, 2011 16:47:44 GMT 1
What dear ole Newton showed was that 'white light' from the sun is actually an entire SPECTRUM, a mixture of light at a range of visible (and non-visible) frequencies. What the prism (and in modern parlance, a spectroscope) do is split light into component frequencies -- in the prism case, it uses the fact that the speed within a medium like glass depends on frequency, so different frequencies get bent by different amounts. So, there is no such thing as white light, just various spectrums of visible light that we will perceive as being 'white'. Here is an example spectrum, where wavelength is used rather than frequency (since you can convert from one to another assuming we are talking wavelength in vacuum/air since they are almost the same), showing how we have frequencies all the way across the visible spectrum for this particular light source. Only if you keep missing the point that 'white light' isn't a frequency, but a spectrum. We can only perceive seven colours (or conveniently label the whole spectrum in terms of about seven coloured regions), but the actual spectrum spans a whole range of perceived colours.
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Post by buckleymanor1 on May 26, 2011 23:09:04 GMT 1
Well it ain't obvious to say the least. White light isn't a frequency but a spectrum there is many who think not. Last time I looked it was white and had no spectral qualities about it. Now if you were to explain that white light was a combination of frequencies and that the prism split it into it's component colour frequencies.That would not make much sense either. Because you know that white light of a specific frequency can be broken by a prism into component colour frequencies. Each one a different colour and traveling at a different speed. White light only shows it's spectral qualities once it has entered a prism.
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Post by StuartG on May 27, 2011 8:13:05 GMT 1
"White light isn't a frequency but a spectrum there is many who think not." Apart from You, who else? I've got to ask this? Are You trying to wind StA up? Your last post doesn't seem to make much sense. What do You consider white light is? Do You suffer from colour blindness? en.wikipedia.org/wiki/Color_blindnessCheers, StuartG
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Post by buckleymanor1 on May 27, 2011 8:40:37 GMT 1
"White light isn't a frequency but a spectrum there is many who think not." Apart from You, who else? I've got to ask this? Are You trying to wind StA up? Your last post doesn't seem to make much sense. What do You consider white light is? Do You suffer from colour blindness? en.wikipedia.org/wiki/Color_blindnessCheers, StuartG Pot kettle black, You Stuart for one. What a short memory you have, This is a quote from your post 89. Now go on tell me you did not mean to say that. Do you suffer from selective memory syndrome .
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Post by StuartG on May 27, 2011 8:57:56 GMT 1
You spectacularly miss the point [purposely?] That is me quoting You from the previous post. Read Your own post. See the words are in quotes ' ' they are called quotes for a reason. Would You like to answer the questions? "there is many who think not" Who? "Are You trying to wind StA up?" [that's me quoting me] "Do You suffer from colour blindness?" StuartG
"Do you suffer from selective memory syndrome" Quite possibly, but not this time.
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Post by buckleymanor1 on May 27, 2011 9:46:18 GMT 1
You spectacularly miss the point [purposely?] That is me quoting You from the previous post. Read Your own post. See the words are in quotes ' ' they are called quotes for a reason. Would You like to answer the questions? "there is many who think not" Who? "Are You trying to wind StA up?" [that's me quoting me] "Do You suffer from colour blindness?" StuartG "Do you suffer from selective memory syndrome" Quite possibly, but not this time. Quite possibly a misunderstanding on my part. In defense though when making quotes it seems clearer to box the quote rather than using inverted commas.As for your reply you don't clearly refute the possibility that white light can be at one frequency before entering the prism.Let me be clear I am not trying to wind anyone up I would just like a clearer picture of the construct of light it's frequency wavelength and speed before entering the prism,whilst the light is in the prism(coloured) and when it exit's Coloured or white. Oh! and I am not any more colour blind than anyone else.
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Post by StuartG on May 27, 2011 10:09:12 GMT 1
"you don't clearly refute the possibility that white light can be at one frequency before entering the prism" I don't need to, the documents, such as Wiki et al, state that. Look at a group of musicians. The tune You hear is the white light. Each separate musician are the colours. StuartG Experiment [next time the Sun is out!] find a solid door facing the Sun, open partially, so that a shaft of light shines through the slit. Find a squre/rectangular section glass bottle [sauce bottle] fill with water. So arrange as to allow shaft of light onto one corner of bottle, what do You get? StuartG
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Post by buckleymanor1 on May 27, 2011 12:51:05 GMT 1
"you don't clearly refute the possibility that white light can be at one frequency before entering the prism" I don't need to, the documents, such as Wiki et al, state that. Look at a group of musicians. The tune You hear is the white light. Each separate musician are the colours. StuartG Experiment [next time the Sun is out!] find a solid door facing the Sun, open partially, so that a shaft of light shines through the slit. Find a squre/rectangular section glass bottle [sauce bottle] fill with water. So arrange as to allow shaft of light onto one corner of bottle, what do You get? StuartG Can you provide a reference which clearly states that this is the case.I have had a look but there is scant material as to what the frequency of light has to be to produce a spectrum, before it enters a prism.Can monocromatic white light passed through a prism produce a spectrum. Sauce bottle that's a novel way of making a prism.
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Post by speakertoanimals on May 27, 2011 15:01:24 GMT 1
There is NO SUCH THING as monochromatic white light. Monochromatic light means light of a narrow range of frequencies (theoretically, just ONE specific frequency), which isn't what white light is. Cos it LOOKS white is daft -- that's just human colour vision. I'd think even you would be aware of what happens when you mix paint -- red plus blue gives purple. This isn't because there are magically any new purple pigments in the paint, but its our perception based on what the red paint ABSORBS, and what the blue paint absorbs. So what is left for us to see in the mixed case is different to either just red paint or just blue paint. Mixing lights is similar. You might like to try this science project: www.sciencebuddies.org/science-fair-projects/project_ideas/HumBeh_p021.shtmlPersonally, I think this is just a wind-up now, with repeated claims that white light is a single frequency, despite this error having been corrected multiple times..........................
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Post by buckleymanor1 on May 27, 2011 16:11:44 GMT 1
There is NO SUCH THING as monochromatic white light. Monochromatic light means light of a narrow range of frequencies (theoretically, just ONE specific frequency), which isn't what white light is. Cos it LOOKS white is daft -- that's just human colour vision. I'd think even you would be aware of what happens when you mix paint -- red plus blue gives purple. This isn't because there are magically any new purple pigments in the paint, but its our perception based on what the red paint ABSORBS, and what the blue paint absorbs. So what is left for us to see in the mixed case is different to either just red paint or just blue paint. Mixing lights is similar. You might like to try this science project: www.sciencebuddies.org/science-fair-projects/project_ideas/HumBeh_p021.shtmlPersonally, I think this is just a wind-up now, with repeated claims that white light is a single frequency, despite this error having been corrected multiple times.......................... I was not making claims I just did not know and from your answer with regards monochromatic light I ain't sure you do. This quote from WIKI seems more to the point. So I don't imagine it would impossible to produce a spectrum from any source of electromagnetic radiation as it is all banded to some degree or other.
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Post by speakertoanimals on May 27, 2011 16:39:57 GMT 1
Except the bandwidth we are talking about there is MUCH less than the bandwidth we are talking about for visible light. Might as well complain that the frequency settings on an old radio make no SENSE, because of course ANY radio signal has to have a finite bandwidth. Didn't stop us having different radio stations at different frequencies though........ I'm mazed you claim to not know that white light ISN'T of a single frequency, given that the fact that white light can be split into its constituent colours is something that most schoolchildren know...................... You keep referring to THE frequency of white light even after it had been explained that there was no such thing. It is very, VERY simple. Look at old-fashioned street lights, the orange ones. That is mostly in a very narrow waveband in the yellow: Compare that with the spectrum of light I gave earlier, which went all the way from the blue to the red. Think about sunlight and the rainbow, which goes through all the colours. Or this different type of sodium lamp: In none of these spectra do you see WHITE, and even schoolkids know that the whole point about illuminating stuff with white light is it shows up all colours. Whereas if you look at green things using red light, they look black. We all know that things look different colours under different illumination, why do some people complain about how things looked in the shop compared to what they look like outside in sunlight? Why do some people complain about the different spectra from new low-energy bulbs compared to old incandescent ones? A wind-up I think, no one could actually be this dim and willing to admit it............................
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Post by buckleymanor1 on May 27, 2011 21:00:06 GMT 1
Nobody explained to any degree of satisfaction what am I supposed to do agree and move on without any amount of certainty. That's just a plain insult, what do I care, water of a ducks back, takes one to know one and any other childish remarks that floats your boat.For crying out loud when are you going to grow out of this tendency to verbally abuse other posters it's boring. We can't all match your superior intelect.
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