Why does a red flower viewed by a green light appear to be black?
White light is composed of varying wavelengths of light. Different wavelengths appear different colours to our eyes. A red flower appears red because it reflects wavelengths most strongly in the red part of the spectrum (about 650-700 nm). Other shorter wavelengths are absorbed by petals.By shining a green light, you are using a filter to remove wavelengths of light that are not green. The filter works by reflecting non-green wavelengths, and allowing only green wavelengths to pass through. As a consequence, the only light to reach the petals is green wavelengths, which are absorbed and not reflected by the red flower. The result is that little light is actually reflected, creating our perception of the flower as black.
If I put a red apple into a room with no light is the apple still red?
I don't know how in depth your knowledge of colour is already, however the basic answer is no - the colour of an object comes from how the material reflects and absorbs light.A beam of 'white' sunlight is made up of all the colours of the rainbow, each colour is described as a wavelength. It goes from short wavelengths of blue, through to longer wavelengths of red.When all the colours are added together they make white.When that beam of light hits an object, some wavelengths of light will be absorbed and certain wavelengths of light will be reflected back toward your eye. This determines the colour of the object - when you see a red object that means the red light is being reflected.So, an object has no inherent colour - colour only happens when light is present. Naturally this is evidenced by the fact that an object's colour appears to change depending on the colour of light hitting it. You might have noticed that certain kinds of yellowish streetlights make everything look almost monotone.Also in very low light, just before it turns to night everyhing becomes kind of a grey blue colour and monotone as well.
Why does red rose appear black in blue light?
You think the red rose is red becoz when white light falls over the rose it absorbs all other colors other than red and emits red light (visible light in the red frequency region) . when blue light falls over the rose it absorbs the blue light but there is nothing to emit so it appears black
Why does a red apple appear red when only green light shines on it?? WILL AWARD 10 PTS!!!!!!!!!!!!!!!!!!!!!!!!
If you truly use a monochromatic light source (one color only, such as a green laser), which in this case would be green, then you WILL see the apple as green. There are many sources, however, that "look" green (or pick-your-color-here) to us because that is the dominant wavelength, but contain other colors as well that you cannot see. BTW, apples are not fluorescent, as mentioned before.
If black is all of the colors does that make white none of the colors?
There are actually two answers here. 1)Light: With light white is all of the colors. white light can be split by a prism into the rainbow and its parts. Black is no light and therefor no color. 2)Paint/physical mediums: White paint is no colors, Black paint is all of the colors, this is also explained by the absorption principal of light. This question depends on how you view it.
Why do objects such as roses or apples only reflect one certain color?
When light hits objects like a rose or apple it excites electrons in atoms in for example pigments in these objects. These electrons react to specific wavelengths which make them reach an energized higher state. When they fall back to their original state they release energy back in the exact wavelength that excited them. This “secondhand” energy (photons) is what you see as reflected light of the pigments color. Light can also be absorbed because it doesn't excite any electrons. So it's not reflected back.
What's the reason an apple would be red inside?
When the apple is peeled or cut for a while, a color change reaction occurs, and the color of the cut surface gradually becomes darker and deeper. Finally, it becomes dark brown. The main reason for this phenomenon is the presence of phenol in the apple. Compounds such as polyphenols, catechols, and the like. These phenolic compounds are easily oxidized to terpenoids after contact with air. During this chemical change, the color of apples gradually changes from white to yellow. As phenolic compounds become longer in contact with air, they participate in chemistry. The amount of the reaction increases, so the color gradually deepens and finally turns dark brown.During the oxidation process, the phenol oxidase in the apple cells is released. Before the tissue is not damaged, that is, before the skin is peeled, the phenol oxidase present in the cell cannot contact the phenol compound due to the barrier of the apple skin, and thus cannot contact the oxygen in the air, and thus the oxidative discoloration reaction cannot occur. When the skin is peeled, the tissue in the apple cells is damaged, and the phenol oxidase is released, thereby contacting with the phenolic compound, accelerating the oxidation of the phenolic compound, and finally, the color change reaction occurs under the action of oxygen in the air.
Why do darker colors absorb more light than lighter colors?
Actually, rather than thinking of them as absorbers of heat, darker colors are better absorbers of light and thereby become better radiators of heat. Consider the following: The color of an object depends on the wavelengths of colors reflected from the object. A red apple is red because red wavelengths in white light are reflected and other wavelengths are absorbed. In fact, if a red apple were to be illuminated by light that had no red wavelengths, the apple would appear almost black. When a black object is illuminated by white light, all wavelengths are absorbed and none are reflected -- that's why the object appears black. I learned this the hard way one dark night when I tried to use my flashlight locate a Black Angus steer that had escaped our pen. All I could see when I shined the light on the steer were two glowing eyes. Getting back to the point; when light is absorbed by a black object, the energy carried by the light doesn't just disappear. Rather, it raises the energy of the object doing the absorbing. The object, in turn, releases the absorbed energy by emitting longer wavelength, lower energy infrared (heat). This transformation of light into heat is the key to understanding the process because it accounts for the law of conservation of energy. Light just doesn't disappear when it strikes a black object -- it's transformed into another kind of radiation that is either radiated from or retained within the black object. The darker the object, the better its emission of heat because it is a better absorber of light.
Can we see light, or do we see objects that reflect light?
If there is ray of light in front of you, but there are nothing to reflect it, then you will not see it although it is passing in front of your eyes. As a result:1- The space always looks dark although there are a lot of light (photons) passing through.2- LASER beam can’t be detected unless there are particles (reflecting or scattering) it.Laser Light Scatters off Chalk DustSo, the answer to this question will be:A) Yes, We can see the “source” of light directly, but we can't see its beam. For example, if you in space and the sun behind you, and you are looking in the opposite direction, then you will never see the sun’s beams crossing you, you even will not know if there is a source of light behind you -if we suppose there is no thermal energy from the sun and there are no objects ahead of you can reflect Sun light- unless you turn and look directly to the source.B) No, we can't see the light if there are nothing to reflect it, but usually -go back to the space example- at least our body will reflect the light which passing through, so we know there are beams of light.(Source: Space sun planet wallpaper)From this picture, you can realize that: there are huge amount of light beams during the day time on Earth due to the sun, however we can’t see them anywhere between the sun and Earth, but we can see their reflection on earth.I hope, this answers your question:).Edited:“Why do we see the reflected light but not the original one?”If this question crosses your mind, then the answer will be again: You actually Can Not see the reflected light; because the original and the reflected light both of them are photons. But as we said before, you can see the source of light if you look directly toward it. So, in the case of the reflected light, the electrons of the object which reflects the light absorb the energy of photons of the origin light then emit them toward you, so that object acts like a source of light which you can see.