Color Absorption SE PDF

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color absorption gizmo...

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Name: ______________________________________ Jennah Hamdan

4/21/2021 Date: ________________________

Student Exploration: Color Absorption Vocabulary: absorb, primary colors, reflect, transmit, transparent

Prior Knowledge Questions (Do these BEFORE using the Gizmo.) A set of primary colors can be mixed to form all other colors. The three primary colors of pigment are cyan (light blue), magenta (neon pink), and yellow. If possible, get three crayons – light blue, pink, and yellow. 1. What color do you get when you mix cyan (light blue) and yellow? ____________________ Green 2. What color do you get when you mix cyan and magenta (pink)? ______________________ Blue 3. As you add more colors, does the resulting color get lighter or darker? _________________ Darker Gizmo Warm-up: Mixing Light In the Color Absorption Gizmo, you can mix different colors of light instead of pigments (like paints or crayons). 1. Observe the three primary colors of light. What are they? Red, green, and blue. _____________________________________________

2. You can click on the lights to turn them on or off. What colors are formed by the following light combinations? Yellow Red and green light: _____________

Magenta Red and blue light: _____________

Green and blue light: _____________ Cyan

Red, green, and blue light: _______________ White

3. As you add more colors of light, does the resulting color get lighter or darker? ___________ Lighter 4. How is mixing the primary colors of light related to mixing the primary colors of pigment? Mixing primary colors darkens the result while primary colors lighten it, but they both do result _________________________________________________________________________

_________________________________________________________________________ in a different color regardless.

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Activity A:

Get the Gizmo ready:

Absorption and Transmission

 Check that all three lights (red, green, and blue) are turned on.

Introduction: If light is blocked by an object, it is either reflected or absorbed. If light passes through an object, it is transmitted. Objects that transmit light without blurring are transparent. Question: How does colored glass transmit and absorb light? 1. Observe: Drag each shade of colored glass into the light box, one at a time. What do you The color gradually grows darker and becomes a black. notice? ___________________________________________________________________

_________________________________________________________________________

Red 2. Predict: What color of light will be transmitted by the Dark red, thick glass? _____________

3. Experiment: For each glass color, turn on the red, green, and blue lights separately. Record the color that results from each combination of glass and light. Glass

Red light only

Green light only

Blue light only

Dark red, thick

Red

Dark green

Blue

Dark green, thick

Maroon

Dark green

Dark blue

Dark blue, thick

Maroon

Darker green

Darker blue

4. Analyze: If a color of light passed through a piece of glass, it was transmitted. If most of the light was blocked by the glass, it was absorbed. Fill in the blanks below. red A. Red glass transmits _________ light and absorbs _________ and _________ blue green light. red B. Green glass transmits _________ light and absorbs ________ and _________ light. blue green green C. Blue glass transmits _________ light and absorbs _________ and _________ light. blue red

5. Draw conclusions: How can you predict what colors will be transmitted and absorbed by Thin glass makes_________________________________________ the color lighter while thick glass makes it darker. The certain color of glass? ______________ more colors added, the darker the result. The more light added, the lighter the result. _________________________________________________________________________

_________________________________________________________________________

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Get the Gizmo ready:

Activity B:

 Turn on all three lights.  Remove all the glass from the light box.

Making colors

Question: How can you filter light to create different colors? 1. Observe: Experiment with different combinations of lights and pieces of glass. See what colors you can create!

2. Challenge: Try to create the following colors using the Gizmo. Use the R G B graph to see that each color matches the goal. (Hint: You don’t have to start with all three lights on.) When you solve one of the challenge colors, click the camera icon to take a snapshot, and then paste the image into a blank word-processing document. Record your solutions below. Challenge

Solution

Color

R

G

B

Lights used

Glass used

Orange

100

50

0

red and green

2 light red thick glasses

Deep purple

70

0

70

red and blue

2 light green thin glasses

Dark gray

25

25

25

Brown

50

25

0

Sea foam

0

50

50

1 thick dark red, 1 thick dark blue, 1 thick dark green glass

red, green and blue

red and green

2 thick light green, 4 light red thick

green and blue

2 light red thick glasses

3. Analyze: Is there more than one way to make a particular color? Try to find at least two ways to make “sea foam.” If possible, see if your classmates found a solution that you did not. _________________________________________________________________________ Using red, blue, and green lights with a thin light blue and thick light green glass makes a darker _________________________________________________________________________ shade of sea foam. Also with same light, two thin light green and a thin light blue glass. 4. Extend your thinking: Use the Gizmo to create your favorite color. Take a snapshot of your color and paste it into your document. Describe your color and how you made it. _________________________________________________________________________ With red light, one thick dark blue, one thick light blue, and one thin dark green glass, the resulting color is sort of a deep red wine-ish color. ________________________________________________

____________

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Activity C: Color analysis

Get the Gizmo ready:  Turn on all three lights.  Remove all of the glass from the light box.

Question: How much light is absorbed by different types of glass? 1. Observe: Compare the effects of thick vs. thin glass, and dark vs. light glass.

2. Form hypothesis: How do the thickness and darkness of glass affect the amount of light that is transmitted? _____________________________________________________________ It lessens the amount of light transmitted through and ultimately darkens it. _________________________________________________________________________

3. Experiment: The bar graph shows the amount of red, green, and blue light measured by the probe. Use the graph to help you answer the following questions. Be sure all lights are on. A. How many pieces of thin, light glass have the same effect as one thick, light glass? _________ Explain: ___________________________________________________ 2 Thin glass results in a lighter color than thick glass. ___________________________________________________________________ B. How many pieces of thin, light glass have the same effect as one thin, dark glass? Thin and thin will make the color lighter, so more is required. _________ Explain: ___________________________________________________ 5

___________________________________________________________________ C. How many pieces of thin, light glass will have the same effect as one thick, dark glass? (Hint: More than are available in the Gizmo!) ___________________________________________________________________ More than 6 because that's the limit in the Gizmo. 4. Extend your thinking: Water is just a little bit blue in color. Why does a glass of water appear to have no color at all, but the ocean is a deep blue color? Water absorbs color in the red part of the spectrum like a filter, while glass is clear so it doesn't _________________________________________________________________________

_________________________________________________________________________ transmit any color but reflect. _________________________________________________________________________ _________________________________________________________________________

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