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what produces color?
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what does the perception of color depend on?
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CHAPTER28
| Question | Answeowr |
|---|---|
| what produces color? | color is produce by the frequency of light emitted or reflected by things. |
| what does the perception of color depend on? | the eye brain system |
| how did newton first show that sunlight is composed of a mixture of all the colors of the rainbow? | He passed a narrow beam of light through a prism which caused the white light to separate into the colors of the rainbow. |
| list the order of colors in the color spectrum(low to high) | Red, orange, yellow, green, blue, violet,(in order from low frequency to high frequency |
| Strictly speaking, are black and white real colors in the sense that red and green are? | Black and white are not real colors ...White is a combination of all colors and black is the absence of color |
| What determines the color of the objects around us? | Color of most objects around us is due to the way the colors reflect light. |
| 7. What happens to light when it strikes a) transparent materials? b) opaque materials? | For transparent materials, light that is not absorbed is reemitted and passes through the material. b) for opaque, reemitted light is reflected (passes back into the medium from which it came.) |
| Which frequencies do a) white objects reflect? b) black objects reflect? | White objects reflects all frequencies. b) black objects reflects none |
| When would we see an object as “red”? | We see an object as red when it reflects red light. |
| Name three common light sources and discuss their range of frequencies | a) candlelight – low in the higher frequencies (blue/violet) so it is yellowish. b) incandescent – emits all visible frequencies but is richer in lower frequencies (red) c) fluorescent is richer in higher frequencies (blue/violet) |
| What does the color of a transparent object depend on? | Color of a transparent object depends on the color of light it transmits. |
| Why is blue glass “blue”? | Blue glass is blue because it absorbs all frequencies except blue. Blue light is transmitted through the glass |
| When red light shines on a red rose, why do the leaves become warmer than the petals? | The petals reflect the red light and the green leaves absorb the red light causing the leaves to become warmer. (light energy is changed to heat energy in the leaves) |
| When green light shines on a red rose, why do the petals look black? | The petals reflect only red light, they will absorb green light. If green light is shining, there is no color to reflect and the petals will look black. |
| Describe white light from the sun. | White light is a composite (total) of all the visible frequencies. |
| What do we learn from analyzing the “radiation curve” of sunlight? | Brightness of frequencies from the sun is uneven. Red and violet not as bright as the middle-range of frequencies (the yellowgreen region). |
| What is the result of mixing light of all the visible frequencies? | white |
| What is the result of mixing red, green, and blue light? | white |
| What happens when the following color lights overlap: ed and blue b) red and green c) green and blue | a) magenta b) yellow c) cyan |
| How do televisions make use of additive primary colors? | Red, blue and green dots are lit in different combinations to produce all the different colors and white. |
| What are the complementary colors for a) magenta b) cyan | a) green b) red |
| What is the result if you begin with white light and subtract some specific color from it? | you get the complementary color |
| What color will white light minus blue light appear | white- blue= yellow |
| How do paints and dyes produce their colors? | They contain pigments that absorb light of certain range of frequencies and reflect light of other ranges of frequencies. (Pigments reflect a mixture of colors) |
| What are the three primary paint colors? (Hint: Remember finger paints!) | red yellow and blue |
| What are the three most useful colors for mixing by subtraction? | magenta yellow and cyan |
| Do tiny particles in the air scatter high or low frequencies of light | High (blue/violet) |
| What frequencies do large particles scatter | low(red) |
| why is the sky blue? | The sky is blue because the tiny particles in the upper atmosphere (nitrogen and oxygen) scatter (reemit in all directions) the high frequencies (blue/violet). Our eyes are more sensitive to blue so we see the sky as blu |
| why does the sky sometimes look whitish? | The sky looks whitish because there are large particles (dust, water vapor) which scatter more of the frequencies of light. When all the frequencies are scattered, it makes white |
| Why would the “sky” on the moon appear black? | There are no molecules in the atmosphere of the moon to scatter the light so the sky is black |
| Why are clouds white? | Different sizes of water droplets cause all different frequencies to be scattered and all frequencies = white. |
| why are sunsets red? | Different sizes of water droplets cause all different frequencies to be scattered and all frequencies = white. |
| . Why is water greenish blue? | Water molecules absorb red and reflect cyan. |
| Does the red light from glowing neon gas have only one frequency or a mixture of frequencies? | Mixture of frequencies that are specific to neon. Neon has its own “fingerprint” of frequencies. |
| Why might atomic spectra be considered the “fingerprints” of atoms | Light from each different element produces its own characteristic pattern of lines. |
Created by:
Kachaj