character: Sound Waves
topic: Frequency and Pitch
grade: 9
subject: Physics
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character: Harmonics
topic: Musical Concepts Related to Frequency
grade: 9
subject: Physics
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character: Acoustics
topic: The Physics of Sound and Pitch
grade: 9
subject: Physics
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character: Musical Instruments
topic: How Instruments Produce Different Pitches
grade: 9
subject: Physics
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