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C. It is produced by moving electrons D. It is produced when free electrons Assessment Choose the letter of the best answer. Write the chosen letter on the space provided before each number. 1. Which is true about sound energy? A. It is produced by electromagnetic waves B. It is produced by the vibration of matter 2. It is a substance through which a vibration travel? D. light A. vacuum 3. These are made by vibration, or the fast, back and forth movement of something. D. light waves A. ocean waves B. sound waves C. electrical waves 4. What is a quick back and forth movement? A. Vibration D. Frequency B. Pitch C. Intensity 5. It is the term to describe what is heard when sound waves pass through a medium to the ear. A. light B. heat C. electricity C. medium D. sound
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