Nov 8, 6: In every last picture, that bilious bright shirt had cast a bright yellowish-green ring around her neck, just under her chin.
Blue Skies and Red Sunsets We have previously learned that visible light waves consist of a continuous range of wavelengths or frequencies. When a light wave with a single frequency strikes an object, a number of things could happen.
The light wave could be absorbed by the object, in which case its energy is converted to heat. The light wave could be reflected by the object.
And the light wave could be transmitted by the object. Rarely however does just a single frequency of light strike an object. While it does happen, it is more usual that visible light of many frequencies or even all frequencies is incident towards the surface of objects.
When this occurs, objects have a tendency to selectively absorb, reflect or transmit light certain frequencies.
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|Literary Analysis Essay- “The Color Purple” | someonesdaughter93||This story is narrated by Celie, a character unsure about who she truly is and who to trust to help her find her way.|
|Light Absorption, Reflection, and Transmission||Historical background[ edit ] Reddish-yellow edges overlap blue-cyan edges to form green. But how I was astonished, as I looked at a white wall through the prism, that it stayed white!|
That is, one object might reflect green light while absorbing all other frequencies of visible light. Another object might selectively transmit blue light while absorbing all other frequencies of visible light. The manner in which visible light interacts with an object is dependent upon the frequency of the light and the nature of the atoms of the object.
In this section of Lesson 2 we will discuss how and why light of certain frequencies can be selectively absorbed, reflected or transmitted. Visible Light Absorption Atoms and molecules contain electrons. It is often useful to think of these electrons as being attached to the atoms by springs.
The electrons and their attached springs have a tendency to vibrate at specific frequencies.
Similar to a tuning fork or even a musical instrument, the electrons of atoms have a natural frequency at which they tend to vibrate.
When a light wave with that same natural frequency impinges upon an atom, then the electrons of that atom will be set into vibrational motion. This is merely another example of the Criticism and reflection of the color principle introduced in Unit 11 of The Physics Classroom Tutorial.
If a light wave of a given frequency strikes a material with electrons having the same vibrational frequencies, then those electrons will absorb the energy of the light wave and transform it into vibrational motion.
During its vibration, the electrons interact with neighboring atoms in such a manner as to convert its vibrational energy into thermal energy. Subsequently, the light wave with that given frequency is absorbed by the object, never again to be released in the form of light.
So the selective absorption of light by a particular material occurs because the selected frequency of the light wave matches the frequency at which electrons in the atoms of that material vibrate.
Since different atoms and molecules have different natural frequencies of vibration, they will selectively absorb different frequencies of visible light.
Visible Light Reflection and Transmission Reflection and transmission of light waves occur because the frequencies of the light waves do not match the natural frequencies of vibration of the objects.
When light waves of these frequencies strike an object, the electrons in the atoms of the object begin vibrating. But instead of vibrating in resonance at a large amplitude, the electrons vibrate for brief periods of time with small amplitudes of vibration; then the energy is reemitted as a light wave.
If the object is transparent, then the vibrations of the electrons are passed on to neighboring atoms through the bulk of the material and reemitted on the opposite side of the object. Such frequencies of light waves are said to be transmitted.
If the object is opaque, then the vibrations of the electrons are not passed from atom to atom through the bulk of the material. Rather the electrons of atoms on the material's surface vibrate for short periods of time and then reemit the energy as a reflected light wave.
Such frequencies of light are said to be reflected. Where Does Color Come From? The color of the objects that we see is largely due to the way those objects interact with light and ultimately reflect or transmit it to our eyes.
The color of an object is not actually within the object itself. Rather, the color is in the light that shines upon it and is ultimately reflected or transmitted to our eyes.
We know that the visible light spectrum consists of a range of frequencies, each of which corresponds to a specific color. When visible light strikes an object and a specific frequency becomes absorbed, that frequency of light will never make it to our eyes. Any visible light that strikes the object and becomes reflected or transmitted to our eyes will contribute to the color appearance of that object.
So the color is not in the object itself, but in the light that strikes the object and ultimately reaches our eye. The only role that the object plays is that it might contain atoms capable of selectively absorbing one or more frequencies of the visible light that shine upon it.
So if an object absorbs all of the frequencies of visible light except for the frequency associated with green light, then the object will appear green in the presence of ROYGBIV. And if an object absorbs all of the frequencies of visible light except for the frequency associated with blue light, then the object will appear blue in the presence of ROYGBIV.
Consider the two diagrams below. The papers are impregnated with a chemical capable of absorbing one or more of the colors of white light. Such chemicals that are capable of selectively absorbing one or more frequency of white light are known as pigments.reflection analysis that is better than traditional heuris- tic segmentation methods that base their analysis on intensity or color differences or on a fixed set of user-.
Criticism and Reflection of the Color Purple by Alice Walker Criticized as a novel containing graphic violence, sexuality, sexism, and racism, The Color Purple .
Reflecting Black: African-American Cultural Criticism (American Culture) [Michael Eric Dyson] on kaja-net.com *FREE* shipping on qualifying offers. From rap music to preaching, from Toni Morrison to Leonard Jeffries, 5/5(1). the colors purple, of which the nightshade and blackberry patches are both shades, and green, the color of the beech and pear trees.
Purple is an earth associated color used in. Criticism and Reflection of the Color Purple by Alice Walker Criticized as a novel containing graphic violence, sexuality, sexism, and racism, The Color Purple was banned in several schools across the United States.
Crude language and explicit detail chronicle the life of Celie, a young black woman. The Color Purple won the American Book Award and the Pulitzer Prize in fiction in Alice Walker’s novel is unique in its preoccupation with .