character: Isaac Newton
topic: Fundamentals of Sound Energy
grade: 12
subject: Physics
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character: Robert Hooke
topic: Properties of Sound Waves
grade: 12
subject: Physics
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character: Christiaan Huygens
topic: Wave Theory of Sound
grade: 12
subject: Physics
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character: Lord Rayleigh
topic: Acoustics and Sound Energy
grade: 12
subject: Physics
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