Colour Definition and 178 Threads

I've been told that the structure of Cu Nitrate is that of a octrahedral and appears similar to the picture attached. also that the distance at which the two verticle orbitals are away from each other varries the intensity of the blue colour, with the further the orbitals being away from each...

From what I know, different metal ions produce different colours. This is due to the fact that electrons jump to the next energy level when energy is absorbed but then released some of that energy back, producing different wavelengths and thus different colours. What I want to know is...

OK, I've looked for about two hours now and can't find what I want (though I've found lots of stuff that doesn't do what I want.) Years ago, Para Paints had a widget on their site that would have you choose one of about 32 colours, and would then give you a palette that matched it. There's...

I mean, what gives them their colour? I know why objects that emit light have different colours, but why do objects that don't emit light have colours?

hi, i need to know why, when propane gas is bubbled into bromine water, no colour changes occurs? if you could tell me i will be very grateful thanks!

If I have a list; list={ {{1, 2}, {1, 3}, {1, 5}}, {{2, 2}, {2, 4}, {2, 1}}, {{3, 3}, {3, 5}, {3, 2}} } and want to plot it using ListPlot[list] Is it possibe to colour all the 1st pairs of the list e.g. {1,2}, {2,2}, {3,3} blue, {1,3}, {2,4},{3,5} green and {1,5}, {2,1}, {3,2} red using...

Homework Statement A source of yellow light in air is observed by a diver inside water. If the wavelength of yellow light in air is 6000A, then find its wavelength and colour as observed by the person. I found out the wavelength inside the water as 4500A. The colour must change as the...

Hi It is know that the colour exhibited by coordinate compound is because of d-d electron transitions. These d-d transition lead to absorption of photons of a paticular frequence. AND when a electron become exited due to absorption of photon it should radiate electromagnetic wave of frequency...

My understanding of colour so far is that if we had, say, a baryon with quark content uuu, we would need to invoke a new quantum number that would allow each quark not to be in the same quantum state to avoid violating the Pauli principle. Now apparently this new quantum number is called colour...

why does the colour of the sticker on the pizza box change when you apply heat to it?

Hi, I know I've seen this question on this site before, but it didn't explain how to do it. I don't even know where to begin... Q: Consider the optical interface between crown glass and ethanol. b) White light travels from crown glass into ethanol. If the angle of incidence in crown glass...

I've been searching on this topic for the past 10 minutes and then realized it'll be better just asking someone about it. Anyway yeah, the question is, are there any specific equations that will give me the wavelength when I give it the colour values? I saw some sites where each colour in the...

How do you colour metal? What are some advantages of corrosion? What are the methods one can use to stain mental or change the colour of metal as the Apple company does to create the wide range of different beautiful colours that their iPod's come in?

Hi. In regards with a black vs yellow t-shirt, which absorbs radiant heat from a indoor gas heater more? Or is the difference too small to tell? Sorry I don't own a yellow tshirt. thanks.

Hi The colour of a solution is the wavelength of the light transmitted through it which is white light minus the absorbed colour. If a solution absorbs light of wavelength 630nm, what colour is it? 630nm is red /orange light. If you look on a colour wheel the complementary colour of this...

So I've been wondering, is it possible to determine how hot a flame is based on the colour? I know that you can classify it into general groups (yellow ~= 1000*C, etc.), but is there any way to get a more accurate temperature estimation? Any papers on this?

Hello; What is colour? Is it like the charge between quarks? I can't conceptually understand it, probably because of the wording. Thanks.

Colour "Chords" Hi, couldn't think of a better title, but it turns out to be rather fitting for what I'm about to describe, I think... I thought of this shortly after being introduced to my first lab involving a spectrometer. We perceive different wavelengths of light in the visible...

Hi, I'm confused about what should really be a simple explanation. What is colour? I've been told that it is because different materials absorb and reflect different colours of light (i.e. different wavelengths between 380 and 740 nm, the spectrum of visible light), but what gives a material...

Do different colours all have different temperatures? what are they? I know that the infrared spectrum is heat, so that must mean the whole spectrum is the same, right? What is the difference between light and temperature?

Why is "silver" perceived as "grey" in colour? I think we can probably agree that grey would be the closest approximation to the colour of reflective surfaces. I am guessing this is similar to the way in which auto exposure works on cameras in that they assume that the entire scene will be 18%...

Can anyone help me establish what is the probable cause of human urine turning a dark reddish colour upon the addition of an amount of bleach? Big thank you. mintymurs

On the weekend I visited Blue Pool in Dorset, England. This is an old abandoned clay mine that has filled with water to produce an attractive pool. Apparently the colour of the pool constantly changes colour... http://www.bluepooltearooms.co.uk/" I didn't observe the colour changes...

what does colour depend on frequency or wavelength?

Homework Statement what experimental evidence is there for the number of different colour charges? this was on one of our past papers but i don't really understand a few of the answers found online and hyperphysics.com seems to have some of the info missing from the page... all i know is...

Gold being a very good conductor should reflect almost all light incident on it and should be appearing white or at least gray. then why is it golden...? pls do reply a detailed answer

I'm looking, as an observer, at imaging accretion discs and tori around Kerr black holes. The image of the disc/torus is projected onto a 2D grid (a CCD if you like) so all lensing effects etc. are implicit. Basically, I can plot the image after determining the (x,y) coordinates in the 2D grid...

EDIT: title should be Is colour dependent on wavelength or frequency Okay, and so here is the question in my mind. We all know (or at least taught) that when light enters an optically denser medium, it slows down and its wavelength shortens. Frequency, however, remains the same. Going by the...

I am having some difficulty understanding the concept of colour charge. I realize that protons and neutrons are made up of a different number of quarks, and this is how they have the charges +1 and zero. I then realized that different quarks have color charge and that in a hadron (protons...

dear forum friend i need a help here did anyone have any idea how to remove black printer ink on colouerd paper without damgeing the other colour , if some know what will the best solution for the . help

my set up was thus; bunsen burner and around 4 metal plates of various colours. certain colours absorbed more heat energy. because temperature and resistance are linked i hypothesized more temperature increase would mean less resistance. when doing the practical the values i got were...

http://www.xrite.com/custom_page.aspx?PageID=77 I thought I got perfect. I am aghast to find I did poorly. I'm gonig to blame it on test conditions. I'll try it again under proper lighting and viewing conditions.

Hello, I am working on a sound/light installation at the moment and was hoping that someone on here might be able to help me with a question i have. I would like to use the composite output from a DVD player to control the intensity and hue of LED light (or 3 (RGB) if need be). So...

Hi, I was wondering what the connection between the colour charges; Y^C , colour hypercharge and I^C_3 , colour isospin charge and the SU(3) symmetry of the colour interaction? Has it anything to do with Noethers theorem to do? Does anyone have good source? Thanx in advance!

basically, what is it? also, is there such a thing as "colour change"? ahh, i have PHY3 tomorrow i can't believe i still don't get this

Homework Statement Hi everyone, I'm having trouble finding anything in the way of information on this problem. If anyone can help I'd appreciate it. I got a couple answers on yahoo answers but nobody could give an explanation for their answer. I want to understand where the answer comes...

If the sky could be any colour other than blue on a sunny cloudless day, what colour would you want it to be? Do you think that we are all so used to the blue colour that we simply couldn't accept any other colour and would get depressed or at least very annoyed about it?

Weird that they're announcing this colour at the beginning of 2008, seems like the 2008 award is a year early. maybe it's so everyone can go out & paint their house this colour. http://www.nytimes.com/2007/12/20/fashion/20COLOR.html?no_interstitial

Homework Statement Describe how the colour degree of freedom of the quarks can be used to explain the fact that, at electron energies of about 20GeV the cross section for e+e- annihilation into hadrons is of the order 4 times the cross section for e+e- -> mu+mu-. Homework Equations None...

i was wondering what this type of paint (the type you see on cars that changes colour as the car moves around) is called? and more importantly, how it works? is it just the different shades of light that reflect the different colours?

the condition for a maximum is ; dsinθ=nλ let d and n be constant then θ (angle) increases as λ(wavelength) increases. So the θ will be the greatest for the highest value of λ ...that implies the frequency is lowest. So I think light of lower frequency are diffracted much ...Am I right?

Can anyone give me an example of a red or yellow precipitate that can be made out of any of the following: Cobalt chloride, calcium hydroxide, iron, sodium carbonate, iron sulphate or copper sulphate. Or any chemical that can be made out of these e.g. sodium hydroxide, copper hydroxide, etc...

Hi, A few days ago, during a discussion at my chemistry class, I suddenly realized something very fundamentally puzzling about colour. We say that if in a molecule (say a conjugated organic system like beta-carotene) the HOMO-LUMO gap corresponds to a visible frequency of light, we observe...

i've seen a film which was orignally black and white but after 50 years or so they made it colour. how did they do it?

A professor wished to figure out who was the smartest of his graduate students. He brought them into his office, blindfolded them, covered all the mirrors in the room, and sat them in chairs facing one another. He told them that he would put either a yellow or a green hat on their heads, but...

hi, i was just wandering what colour you see best in a why?, i mean if a room was to be flooded in red blue or green what would be the best for the resolving power of the eye. thank you very much, alex

What determines why we say a certain colour is our favourite colour? And do favourite colour choices run in families?

I have done a little research on the internet and I would like to ask my concept is correct or not. 1) Sky is blue As the effect of rayleigh scattering is more effective for shorter wavelength, blue light scatter more than others (e.g. red). Furthermore, our eyes are more sensitive to blue...

Hi. I'm just curious why did the colour of the heating element of my soldering iron change (see the picture attached). I mean I know it's because of the heating but what exactly makes the colour change? Is it oxide? Or is it because of a change in the crystalline structure of the metal?

According to the definition of some online encyclopedias, black is defined as an absence of colour. My own definition of black is a phenomenon which totally absorbs all light shining on it, thus rendering it black. Now, is black considered a colour? Points raised: 1) In the electromagnetic...