1. Waves
Teaching Slides, 3.3
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Waves Course, 3.3: Color

2. Science Log Quarter 4 Week 7
 Monday 5/8:
What is your favorite color?
What is your least favorite color?
Waves Course, 3.3: Color

3. Spectra page 42
Notebook sheet 17, How Do We See? Think about 2 claims and write your initial responses individually. Then, share with your table
Waves Course, 3.3: Color
Step 1

4. Discuss sight Discuss your reasoning.
What happens in a room that is completely dark? If your eyes are are somehow sending out light waves, how come they do not work in a totally dark room?
Waves Course, 3.3: Color
Step 2

5. 3. Explore filters Each pair will get 2 filters,
Look around the class to see what things look like through the filters
What do these color filters do?
They let only one color of light pass through.
Open your notebooks and make a quick model to explain your idea
What needs to be added to the model to show waves reflecting.
Waves Course, 3.3: Color

6. 3. Explore filters You know that waves can reflect off surfaces.
What our eyes see as color is actually light reflecting off different objects.
When you see blue, that is one kind of wave that is reflecting toward your eye.
As you learned with the spectroscope, blue light has a specific wavelength.
When you see red, that is another kind of wave that is reflecting toward your eye.
Red light has a specific wavelength. It’s different from the blue wavelength.
Green has its own wavelength, purple has its own wavelength, and so on.
Waves Course, 3.3: Color

7. Explore filters
Light waves reflect off the objects that you see. Where do those light waves originate?
Whatever light source is present; Sun, ceiling lights, etc.
Why can’t you see color in the dark?
There are no (or very few) light waves reflecting off surfaces.
Waves Course, 3.3: Color
Step 3

8. Focus question 3.3 page 43
What makes objects appear as different colors?
Waves Course, 3.3: Color
Step 4

9. Focus the exploration
You will look at each color box on the sheet through each color filter to learn more about the properties of light waves.
We want to analyze the light reflected by each colored box on the sheet.
The original source of the light is the classroom lights, or skylight.
When light sources shine on any surface, three things can happen: some colors of light may be absorbed, some may be reflected, and some may pass through.
Consider what happens to the light as it hits the boxes on the paper and eventually ends up at your eyes.
Waves Course, 3.3: Color

10. Focus the exploration
Waves Course, 3.3: Color
Step 5

11. 5. Focus the exploration
What does reflect mean, when we are talking about waves?
To bounce off
What does absorb mean, when we are talking about waves?
To take in.
Waves Course, 3.3: Color

12. Describe filter use
Waves Course, 3.3: Color
Step 6

13. Analyze color reflection
Think about the light waves as you view each box, especially when you view the black and white boxes.
You will be able to determine whether the box appears light or dark through each filter and so use this to think about the light reflecting from the box.
Waves Course, 3.3: Color

14. Analyze color reflection page 44
Notebook sheet 18, Color Reflection Observations Color analysis card Record your observations
Waves Course, 3.3: Color
Step 7

15. Discuss color reflection
Based on your data, what statements can you make about the relationship between the color of the objects and which colors they absorb or reflect?
Waves Course, 3.3: Color
Steps 8

16. 8. Color reflection notes page 45
Share you ideas and explain your reasoning
White objects reflect all colors of light and absorb no colors of light.
Reasoning: When we looked at the white box with each color filter, we could see that color.
That meant that each wavelength we considered was reflected back from the box. No colors were absorbed.
Waves Course, 3.3: Color

17. 8. Color reflection Share you ideas and explain your reasoning
Black objects reflect no colors of light and absorb all colors of light.
Reasoning:
When we looked at the black box with each color filter, we could see no color.
That meant that each wavelength we considered was not reflected back from the box.
They must have been absorbed.
Waves Course, 3.3: Color

18. 8. Color reflection Share you ideas and explain your reasoning
An object of a particular color reflects light of that color and absorbs other colors.
Reasoning:
When we looked at each box with its own color filter, we could see the color, so that color was reflected back from the box.
But when we used the other colors, we saw black.
Those colors must have been absorbed.
Waves Course, 3.3: Color

19. 9. Real-world implications
When you look at grass, why do you only see green and not all the other colors of the Sun’s light?
The grass surface absorbs certain wavelengths and reflects others.
The grass absorbs many wavelengths and reflects green light waves to our eyes.
Waves Course, 3.3: Color

20. 9. Real-world implications
When you look at something, what color is being reflected to your eye?
The color of the object
What colors are being absorbed by the object?
All other colors/wavelengths of light
Objects of different colors reflect certain wavelengths of light (the color they appear) and absorb all other wavelengths.
Waves Course, 3.3: Color

21. 10. Objects in the room Look around the room with the filter again
Pick an object and describe to a partner
The name of the object,
Its color, and
A description of how it looks through the green filter and through the red filter.
Waves Course, 3.3: Color

22. 11. Absorb all light
Predict what will happen when you look through both the red and green filters together.
Why do the red and green filters together block all light?
The red filter absorbs all colors except red, and the green filter absorbs the red light, too.
Waves Course, 3.3: Color
Step 11

23. Homework page 46 Notebook sheet 19, Response Sheet—Investigation 3
Waves Course, 3.3: Color
Step 12

24. Homework
Notebook sheet 19, Response Sheet—Investigation 3 Draw a line and add: Light waves reflected off an object determine the color of an object. Both wavelength and frequency are properties of light waves that determine color.
Waves Course, 3.3: Color
Step 12

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Photo credits:
Cover slide: © Sergey Nivens/Shutterstock
Notebook image: © photastic/Shutterstock
Waves Course, 3.3: Color