character: Hermann von Helmholtz
topic: Theory of Sound and Music
grade: 12
subject: Physics
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character: Johannes Kepler
topic: Harmonics and Astronomy
grade: 12
subject: Physics
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character: Isaac Newton
topic: Wave Theory of Sound
grade: 12
subject: Physics
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character: Jean-Baptiste Joseph Fourier
topic: Fourier Analysis and Sound Waves
grade: 12
subject: Physics
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