character: Hermann von Helmholtz
topic: Theory of Sound and Vibrations
grade: 12
subject: Physics
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character: Isaac Newton
topic: Classical Mechanics and Sound Waves
grade: 12
subject: Physics
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character: Fritz Kreisler
topic: Vibrations in Musical Instruments
grade: 12
subject: Physics
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character: Richard Feynman
topic: Quantum Mechanics and Sound Theory
grade: 12
subject: Physics
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