character: Christiaan Huygens
topic: Sound Waves
grade: 11
subject: Physics
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character: Isaac Newton
topic: Wave Theory of Sound
grade: 11
subject: Physics
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character: Robert Hooke
topic: Vibrations and Sound
grade: 11
subject: Physics
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character: Lord Rayleigh
topic: Acoustics and Wave Propagation
grade: 11
subject: Physics
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