COLOR
Color Spectrum What we see determines what is interpreted Isaac Newton first to study using , showed sunlight is made of
Spectrum spread of (low freq -> high freq) White light white objects appear and colored objects appear all colors combine to black is the ; it all visible frequencies black objects all light otherwise you couldn’t see them; some light
Color by Reflection Color of objects due Light is (like a tuning fork) once excited to vigorous motion, send out their in all directions
Different materials have different natural frequencies for absorbing and emitting radiation resonant frequencies , light is frequencies below , light is reemited light materials light medium which it came if =
Most of some and the rest e.g. if an object most visible light frequencies and green, If an object light of , it will be the as the light that If a material the light that on it, it
NOTE: an object can present in the illuminating light The perceived color of an object is depends on Best light to determine color =
Color by Transmission Color of depends on the color of the Material in glass that colored light = Electrons in pigment atoms of certain frequencies Light of other frequencies in the glass Energy is , glass
Mixing Colored LIGHT White light comes from ALSO comes from mixing just Divided into three regions: freq ( ), freq ( ), freq ( ) Combinations red & green = red & blue = green & blue =
Complementary Colors When two colors are yellow + + green + Not all the upon an object is ; some part that is is from i.e. on pigment that absorbs , reflects
Fig 28.10 Lighting objects with shadow of object will of light it is Objects will not primary color
Mixing Colored Pigments Mixing and is ENTIRELY different from pigments reflect a Color mixing by is used with pigments in and and mixed absorbs all colors except Color mixing by is used in primary colors
Why the sky is blue Atoms and molecules behave like and waves , the frequency of light it will sent in Most UV light by Some UV light and is by particles and molecules in scattered the most BUT our eyes ; our eyes we see a
Increased and other , allows to sky is after rains, and sky is sky appears when there are White clouds produced by combination of waves caused by
Why Sunsets are Red When light passes thru thick atmosphere, light of while light of @ sunset, light reaches us thru more remains in sunlight Sun gets
Water a pale to nearly all Absorbs and resonates Resonate somewhat to of red light Red taken from =
Atomic Spectra Spectroscope analyzes All elements The and of light can be analyzed on a Combination and magnitude found on line spectrum Each element has =