Critical Thinking
Comparing and Contrasting How are microwaves and infrared rays similar? How are they different?
Applying Concepts How does the frequency of a car's returning radar signal change if the car moves away from the radar source?
Applying Concepts What color would the sunset be if you observed it on the moon? (Hint: the moon has no atmosphere.)
Comparing and Contrasting List the three primary colors of light and the three primary colors of pigments. What is the result if the three primary colors of light are mixed? What is the result if the three primary colors of pigments are mixed?
Use the illustration below to answer Questions 29—31.
Interpreting Photos Describe each combination of colors in A, B, and C.
Applying Concepts If you had green paint, such as produced in mixture A in the illustration, what is the fewest number of colors you could mix with it to get black? What would the color or colors be?
Predicting What color would you expect to make if you combined cyan and yellow from A, magenta and yellow from B, and only the magenta from C? Explain why.
Inferring Why might it be unsafe to look directly at laser light?
Math Skills
Calculating An FM radio station broadcasts on a frequency of 91 MHz. What is the wavelength of the wave that carries the coded information?
Calculating What is the frequency of a microwave that has a wavelength of 0.050 m?
Converting Units Convert the speed of light to miles per second and miles per hour. (Hint: 1 mile = 1610 meters)
Concepts in Action
Problem Solving What can you do to ensure even heating of microwaved food? Why does that work?
Predicting Are you more likely to see a mirage in the desert when the temperature is 32°C or 23°C? Explain why.
Relating Cause and Effect You are working the lights for a school play. The red jacket on the main character looks red, but her green pants look black. What is happening? How can you make both her jacket and her pants look their true color?
Writing in Science Write an advertisement for a sunscreen product. Make sure to explain to consumers why ultraviolet rays are dangerous.
Performance-Based Assessment
Comparing and Contrasting Visit a store that sells a variety of light bulbs including incandescent bulbs, tungsten-halogen bulbs, and fluorescent bulbs. Gather information from the packages on price and expected hours of service and display the data in a table. Conclude from your data which kind of bulb provides the most economical lighting for a particular purpose. Write your conclusions in a paragraph and share it with your family and classmates.
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