Name:
Period:
Date:
52
Lesson 8 and 9 “Subtractive and Additive Color Mixing” Review Sheet
Lesson 7 “Investigating the Invisible” Key Terms: Wavelength, Frequency, Hertz, Nanometers,
Radiation, Electromagnetic Spectrum
1. What are the forms of electromagnetic radiation?
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The forms of electromagnetic radiation are radio (lonest wavelengths), microwaves, infrared,
visible light, ultraviolet, x-rays, and gamma (shortest wavelengths).
2. Be able to label the forms of electromagnetic radiation from longest wavelength to the
shortest wavelength.
3. What form of radiation on the electromagnetic spectrum is visible to the human eye?
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The form of radiation that is visible to the human eye is visible spectrum (ROY G BIV).
Lesson 8 “Looking at Colors” Key Terms: Reflection, Absorption, Pigment, Color Filter, Subtractive
Color Mixing
1. Use a diagram and words to explain why a shirt looks blue when held in white light.
Example for red shirt and blue shorts:
2. Why do objects appear white in white light? Why do objects appear black in white light?
- A white object appears white in white light, because it reflects all of the colors in the visible
spectrum. A black object appears black, because it absorbs all of the colors in the visible
spectrum.
3. What is a color filter?
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A color filter is a transparent sheet that absorbs or reflects certain wavelengths of white light.
Name:
Period:
Date:
52
4. When John looked at a red object through a green filter. What color did the object appear?
Why do color filters change the color of an object viewed through a filter?
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The object appears black, because the filter absorbed the wavelengths of light that were
reflected from the object.
5. What are the primary and secondary colors for subtractive color mixing?
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The primary colors of subtractive color mixing are magenta, yellow, and cyan.
The secondary colors of subtractive color mixing are blue, green, and red.
Lesson 9 “Color Lights” Key Terms: Additive Color Mixing
1. Max is responsible for controlling the stage lighting for the school play. He only has white, red,
green, and blue spotlights. In one scene he must spotlight the villain using yellow. What
combination of spotlights should be used? Why?
- He should use red and green spotlights, because when these two wavelengths of colored
lights are mixed, our brains perceive this mixture as yellow.
2. The type of color mixing that Max used in Question 2 is called additive color mixing.
3. Please define the two types of color mixing and provide at least two examples of objects that
use each type of color mixing to produce color.
- The two types of color mixing are subtractive and additive color mixing.
- Televisions, cellphones, and computer screens use additive color mixing to produce color.
Color printers, color photography, and paint use subtractive color mixing to produce color.
4. What are the differences between additive and subtractive color mixing? Please list all of
them.
- Use the Venn diagram from page 50 to identify the differences between additive and
subtractive color mixing.