character: Wave Hunter
topic: Properties of Sound Waves
grade: 9
subject: Physics
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character: Sound Explorer
topic: Characteristics of Sound Waves
grade: 9
subject: Physics
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character: Echo Finder
topic: Reflection and Refraction of Sound
grade: 9
subject: Physics
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character: Frequency Master
topic: Understanding Frequency and Pitch
grade: 9
subject: Physics
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