character: Dr. Echo
topic: The Physics of Sound and Ultrasound Technology
grade: 9
subject: Physics
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character: Professor Wave
topic: Understanding Sound Waves and Their Properties
grade: 9
subject: Physics
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character: Sonic Investigator
topic: Exploring Ultrasound: Applications in Medicine and Industry
grade: 9
subject: Physics
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character: Echo Explorer
topic: The Science of Echolocation and its Uses
grade: 9
subject: Physics
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