1. As part of his job at the U.S. Forestry Service, Scott uses satellite images to identify forest areas that have been cleared due to logging. The satellite images, which show forests appearing cooler and cleared areas appearing warmer, are produced using electromagnetic radiation. Which part of the electromagnetic spectrum does Scott’s technology most likely use?

2. When NASA scientists communicate with the mars rover they use electromagnetic radiation with a long wavelength and low energy. Which type of radiation do they most likely use?

3. Light can sometimes create an optical illusion. For example, you may see something under water and reach into the water to pick it up. However, the object is not where you thought it would be. What property of light is responsible for this optical illusion?

4. What is the name given to the substance through which a wave travels?

5. A wave will travel only as long as it has ____ to carry.

6. How does the sun transfer energy to Earth?

7. If you are lying on a raft, and you notice that the number of waves that go past the raft increases, you also find that the distance between each crest ____.

8. Electromagnetic waves ____.

9. ____ are used for medical imaging.

10. The part of the electromagnetic spectrum usually used for communication is ____.