Color Definition and 496 Threads

I understand the basics of color theory and I need to explain it to some graduate level bio-students. Now I need to incorporate the biological funciotions involved in this process and relate it to avian species. Now I have a brief understand of the human eye abosorbtion curves which peak at...

the color of light can be change by the change in wavelength? Each color of light has specific range of wave length.So if light will go in dense medium then its velocity will decrease...Acc to equ.. Velo=freq *wavelength so wave length also will decrease bcoz frequency...

Why the black objects absorb more light and heat from the other color objects? What is the structure of the black color?

I like this test http://www.colorquiz.com/ Much more than the one you linked to.

Very interesting: http://www.sciencedaily.com/releases/2005/10/051026082313.htm

Well, this is awkward. I seem to have forgotten what star has a 0.0 value in the V-I color index. I almost want to say Vega but that's the 0.0 in the B-V color index. I also seem unable to find raw data for the V-I color index values for spiral galaxies and was wondering if someone would...

So, as you may or may not have known there's an interesting correlation between galaxy brightness and it's color. Basically, the brighter the absolute luminosity of a galaxy the redder it tends to be when compared to galaxies of the same type. I say "tends" because randomness does give the...

I don't think i clearly understand what color is on the molecular level... white light strikes a surface, and some of it gets reflected, and some gets absorbed, and you perceive the color based on what light gets reflected. That is ok, but what property of the material or the atoms that make it...

How can one say what color a matter have by using optical reflectivity? I know how to calculate the plasmon energy and out of that can one can get the wavelength. So can one get the color of the wavelength or? Thanks

Why is the group delay of a filter inversely proportional to the filter bandwidth? For example in a color TV transmitter the luma signal must be delayed with respect to the chrominance signal before they are added together because the luma signal has a larger bandwidth.

Homework Statement I need to know how to calculate the temperature of a star from it's B-V color Homework Equations B = -2.5log(F440)+C V = -2.5log(F550)+C B-V = -2.5log(F440/F550) The Attempt at a Solution Really no idea, all my textbooks say that B-V color is used to...

I made a cleaning solution that could clean anything. It was made from: -1L of 5% bleach (normal stuff at any store) -3L of 70% isopropyl alcohol -1/2 cup of dish soap -a dash of Comet -1 tablespoon of concentrated ammonia The solution would settle out as a cloudy yellow mixture. When...

Write a TSR program that changes the background color of the screen to red every 5 second and then white next 5 second, And this continues until you press ‘Q’ It should not modify the text displayed on the screen. Hint: 1_ Intercept Keyboard interrupt (0x09H) 2_ Use video text memory...

Basically, isn't it safe to say that a single atom is colorless, and that color can only be perceived once multiple atoms are arranged in a manner that will reflect and absorb certain wavelengths of visible light?

Can someone explain to me why there are difference in humans hair color? Why black and blond and brown and red only? Why not green?

Something happened that reminded me of this tonight, and I think I have finally made sense of something seen as a kid. For some odd reason it just hit me. When I was fairly young and living in the Los Angeles area, there was a test done one night on a local TV channel that was supposed to...

Is there any reason why most hot things alost always begin to get the tinge of red??

hey just wondering is it because you wear a white shirt that you're going to feel less heat, and because you wear a black shirt that you're going to feel more heat like everyone thinks ? does it depends on the material ? on the heat conductance of the material ? because from what i...

Homework Statement Among the complex ions formed by Co^{3+} match each ion to its color. 1 [Co(CN)_{6}]^{3-} 2 [Co(NH_{3})_{6}]^{3+} 3 [CoF_{6}]^{3-} 4 [Co(H_{2}O)_{6}]^{3+} A Blue B Green C Pale Yellow D yellow-orange The Attempt at a Solution I found the ligands for each mode. 1 CN- 2...

i hope this wasnt already asked. i couldn't find it anywhere. you and 2 others are placed in a room with blindfolds. a hat is placed on each of you. it is either red or black. the blindfolds are then removed. you are told to stand if you see a red hat. everybody stands, while obeying the...

I have a good friend that I like to debate with. We spent about three hours discussing this one. What are the three primary colors? I said Red, Yellow, and Blue. He said Red, Blue and Green. We were both correct. Why? o:) :biggrin:

Suppose you fill up a beaker with 1 mole of isolated HIV. What would be the consistency of this collection of HIV? Slimy? Liquid? What color would it have? If you would put your finger in it, would it infect you if you have no open wounds on your finger, i.o.w. does it penetrate through your...

Homework Statement A gardener has 12 tulip bulbs to plant in a box (4 columns by 3 rows). There are 4 white, 4 red and 4 yellow bulbs, and exactly one bulb is planted in each small square. a. How many different color patterns are possible? b. How many of these patterns have each row...

Cu(NH_3)_4(OH)_2 Ag(NH_3)_2Cl I tried to research on wikipedia but found none... Any help would be greatly appreciated... :smile:

Is there any way to get color from RGB value? for example If I give some random RGB value like r=221 g=255 b=123 then how do I get the color associated this RGB value? Thanks in advance.

Earlier today, I was browsing a wonderful WWI inventory of color photographs when I stumbled upon some rather strange looking ones.If you go to the color picture gallery on the left side column of the page and then go to page two, you will see a few examples of what I am talking about...

The color code for hidden text is #black. Some of these questions are insanely tough. I'll post the answers after sufficient participation. 1) The first is a picture of a person who starred in a famous American sitcom of the seventies. The second is of a famous director. The third is that of...

this question is contained on a gcse past paper i am doing and i think I am approaching it from the wrong angle but have tried a few times and don't know where i am going wrong :( hope you can help Homework Statement A bag contains (n+7) tennis balls. n of the balls are yellow. The...

Hi all, why is it that girls are more generally acceptable to the colour pink? (e.g. painting the whole room pink and wearing pink clothings etc.) And guys tend to shunt away from pink colour ? Is it pre-programmed into our mind?

when light pass through the spectrum,different colour of light appear on the screen.i want to ask if the freuquency of the different.color of light is different Is the speed different or is their speed all equal to 3x10*8? The level of the diffraction of these light is depend on...

Hello, I have some question I want to ask. 1) Let's say there identical twins marry identical twins, and they have baby's would the baby's of the two families share the same DNA as if they were brothers? If someone didn't understand I mean: male and female which have identical brother or...

OK, this would have been funny if it were a joke. However, the American Physical Society (APS) has produced a http://www.physicscentral.com/coloringbook/index.html" . It intends to "... introduce children to physics and some of its most famous characters..." I kid you not! :bugeye: How...

I'm currently learning in my E-M class about the phonomenon of absorption, and I'm trying to figure out why we see what we see, but there are gaps in my understanding. Regarding insulators: Depending on the composition of the material, there are various "absorption spikes" that will "kill" the...

I've read somewhere around here someone saying that the color red is an abstraction and it does not exist on its own, which is to say, there can be a red car, but the red car is not the thing that makes up the color red. I went on to think about this, and what is then the color red? First...

hey all I've read a couple articles about eye color changing with ageing, well here's the thing i have brown eyes but my father which is 48 has light brown kind of hazel looking eyes and my mom brown.I was wondering sense I am 16 will my eye color change as i grow older?

Hi, i had this question about the light: " what does the color we see depends on? Frequency or Wavelength ? "

I cannot understand what is the colour of water.I was reading an Optics book by Hecht,& suppose that we see coluured bodies due to Dissipative absorption.That is taking up of incident photon,converting a part into thermal energy,and releasing the rest energy as another photon.But, ordinarily we...

Check out the castle illusion on this page: http://www.ebaumsworld.com/castle-illusion.html (Instructions on how to view this are just above the picture.) How do you think this works? There's another one on this page: http://www.johnsadowski.com/color_illusion_tutorial.html that explains...

im reading some of feynman's lecture notes, and i stumbled upon a statement which i do not understand... he says that we can use ANY three different colors to produce any other color. lets say we want to see the color X, and we use yellow blue and red (Y,B,R) then X = yY + bB + rR. where...

This question is driving me crazy It is a bayesian probability question what is the probability of guessing the color of the 51st card correctly IF you have already drawn 50 cards and know exactly what colors each one cameout to be thank you khurram

Hello, I'm wondering why do we have colors? If protons and neutrons are build upon the same particles shouldn't we have one single color? Else, if you put something transparent of for example red color under the beam of light, light will become of the color of the thing you put under, why is...

I never really learned this, and it popped up yesterday. Can someone explain to me how to compound colors are all determined by the d orbitals and would it be only the d orbitals. it would be very helpful, thanks.

I'm giving a small talk soon, so I've decided I should probably have a pointer to keep things on track. However, there are too many colors available, it's overwhelming; I don't like making decisions. My thoughts: Red just isn't that cool anymore. The dot is small and not very visible by...

What wouldit mean if your blood is dark?

An oil slick 122 nm thick (n = 1.4), lying on water, is illuminated by white ligiht incident, perpendicular to its surface. What color will the oil appear and calculate the wavelenght.

http://www.nytimes.com/2005/12/16/science/16gene.html Yesterday's issue of Science magazine, and this article in the 16 December NY Times report that a major determinant of skin color is a single gene which has been located reportedly 99 pecent of European caucasians have one allele, one...

If differing wavelengths explain color variations, would not the longer "zig-zags" of the separate colors for the bluer spectrum portions of visible light suggest that they have traveled longer to get to a discrete point from that of their origin? - Assuming that the component colors of...

I'm trying to carry out a color blindess test for a biology project. My friend, who is color blind, will help.. but I'm wondering what kind of tets I could use (besides the Ishiraha test). I'm thinking having two pictures displayed.. and then brining down the "hue" color of a single color in...

I have no doubts that the eye colors of infants can change during the first several months of life. I've got my own proof in my sibling's (and my own) baby pictures. But what about years later, like adolescence or even adulthood? I know people who say their eye colors change depending on...

The reply box is a funky grey-ish color. actually it's not funky at all. I think I liked the old one better. Aside from that what's changed? I havn't noticed anything yet...