CHAPTER28
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| what produces color? | color is produce by the frequency of light emitted or reflected by things.
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| what does the perception of color depend on? | the eye brain system
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| 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.
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| 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
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| 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
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| What determines the color of the objects around us? | Color of most objects around us is due to
the way the colors reflect light.
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| 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.)
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| Which frequencies do a) white objects reflect? b) black objects reflect? | White objects reflects all frequencies.
b) black objects reflects none
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| When would we see an object as “red”? | We see an object as red when it reflects red
light.
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| 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)
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| What does the color of a transparent object depend on? | Color of a transparent object depends on
the color of light it transmits.
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| Why is blue glass “blue”? | Blue glass is blue because it absorbs all
frequencies except blue. Blue light is
transmitted through the glass
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| 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)
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| 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.
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| Describe white light from the sun. | White light is a composite (total) of all the
visible frequencies.
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| 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).
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| What is the result of mixing light of all the visible frequencies? | white
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| What is the result of mixing red, green, and blue light? | white
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| 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
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| 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.
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| What are the complementary colors for a) magenta b) cyan | a) green
b) red
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| What is the result if you begin with white light and subtract some specific color from it? | you get the complementary color
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| What color will white light minus blue light appear | white- blue= yellow
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| 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)
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| What are the three primary paint colors? (Hint: Remember finger paints!) | red yellow and blue
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| What are the three most useful colors for mixing by subtraction? | magenta yellow and cyan
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| Do tiny particles in the air scatter high or low frequencies of light | High (blue/violet)
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| What frequencies do large particles scatter | low(red)
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| 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
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| 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
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| 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
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| Why are clouds white? | Different sizes of water droplets cause all
different frequencies to be scattered and all
frequencies = white.
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| why are sunsets red? | Different sizes of water droplets cause all
different frequencies to be scattered and all
frequencies = white.
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| . Why is water greenish blue? | Water molecules absorb red and reflect
cyan.
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| 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.
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| Why might atomic spectra be considered the “fingerprints” of atoms | Light from each different element
produces its own characteristic pattern of
lines.
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
Kachaj