ch28_amas

__**Color**__ Issac Newtown was the first to make a systematic study of color. If you shine a beam of white light through a triangular prism you can see te light bed and split up by color into a spectrum. Under white light white objects apear white and colored objects apear individual colors. If all the colors of the spectrum were to recombine the result will be white light. Black is similarly not a color its self, but is the absents of light. Sunlight is an example of what is called white light. [] The colors that are absorbed are not seen, but the colors that are reflected are seen. No other colors are possible besides the ones shining on the object. If white light shines through a transparent obbject some wavelengths witll be absorbed while others will pass through. The energy absorbed by the object will turn into heat and  cause the temperatur to increase slightly. **28.4 SUNLIGHT** Sun light is composite of all the visible frequencies as well as many others that we cannot see. The brightest colors have less intense frequencies. The additive primary colors are red, blue, and green. When the three are added together, it produces white light. ** 28.6 ** COMPLEMENTARY COLORS Complimentary colors are pairs of colors that togethere include each primary color. Cyan, which is blue and green light, is complimentary to red. When two complimentary colors are added together the result is white light. Red + Green = Yellow Red + Blue = Magenta Red + Cyan = White Blue + Green = Cyan Magenta + Green = White Yellow + Blue = White Pigments absorbe the complimentary colors to the ones that they reflect. A cyan pigment will absorb red light and reflect blue and green. If two pigments are mixed the resulting pigment wil absorb all colors absorbed by either of the pigments, this is known as mixing by subtraction. If yellow pigment is mixed with cyam pigment the resulting pigment will absorb both blue and red and will reflect green light. The subtractive primary colors are cyan, magenta and yellow. [] The sky is blue because microscopic particles in the atmosphere some of the light will be absored and scattered by the particles it passes through. The shortest wavelengths of light are violet and blue, causing the sky to appear to be blue. The remaining longer wavelengths cause the sun to appear yellow. **28.9 WHY SUNSETS ARE RED []**
 * 28.1** THE COLOR SPECTRUM
 * 28.2 COLOR BY REFLECTION ** When white light shines on an object some of the light will be absorbed and some will be reflected. It depends on the material of the object.
 * 28.3 COLOR BY TRANSMISSION**
 * 28.5 MIXING COLORED LIGHT**
 * 28.7 MIXING COLORED PIGMENTS **
 * 28.8 WHY THE SKY IS BLUE**

Sunsets are red because when the sun is low in the sky the light has a much longer path to reach you eyes. The longer wavelengths will be scattered leaving only red and oranger light to reach the surface of Earth. Therefore, when light passes through a thick atmosphere, light of the lower frequencies is transmitted while light of the higher frequencies is scattered. The colors of the sun and sky are consistent with our rules for color mixing. the relative amounts of scattering depends on atmospheric conditions, which change from day to day and give us a variety of sunsets. Water is a greenish blue becaus the water absorbs a very small amount of red light. In a large amount of water there is an absents of red, making the water appear to be cyan. Water is transparent to nearly all the visible frequencies of light. water molecules absorb infrared waves because they resonate to the frequencies of infrared. Infrared is a strong component of the sunlight that warms water. In summary, the sky is blue because blue from sunlight is remitted in all direction is by molecules in the atmosphere. Water is greenish blue because red is absored by molecules in the water. the colors of things depend on what colors are refleced by molecules and also by colors are absored by molecules. The pattern of light seen through an spectroscope is called a line of spectrum. It is different for every element.
 * [[image:http://www.fhsu.edu/geo/esw/Photos%2006/PC0608_water%20copy.jpg width="300" height="402" link="http://www.fhsu.edu/geo/esw/Photos%2006/PC0608_water%20copy.jpg"]] 28.10 WHY WATER IS GREENISH BLUE**
 * 28.11 THE ATOMIC COLOR CODE-ATOMIC SPECTRA**