character: Dr. Sonic
topic: Sound Scientist, Properties of Sound Waves
grade: 9
subject: Physics
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character: Wave Whisperer
topic: Sound Waves and Their Behavior
grade: 9
subject: Physics
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character: Professor Echo
topic: Exploring Sound Properties
grade: 9
subject: Physics
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character: Frequency Finder
topic: Understanding Sound Frequencies
grade: 9
subject: Physics
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