Attorney General Mike DeWine says Ohio’s crime lab has processed nearly 5,000 previously untested rape kits as it searches for DNA matches that could help solve reported sexual assaults.
Sound and Vibration Instructor’s Guide
Sound is a form of energy produced by vibrating objects. Without movement there could be no sound. When an object moves or vibrates, the air molecules around the object also vibrate. Vibrating objects (as long as they are not in a vacuum) produce sound. A sound wave contains energy, which in turn means it can make the air around it move. However, if the wave strikes something solid, the wave will bounce back—an echo.
This two-part demonstration uses an aluminum rod and a mixture of cornstarch and water—oobleck—to show that sound is produced by the vibration of matter.