character: Galileo Galilei
topic: Fundamentals of Sound Waves
grade: 9
subject: Physics
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character: Isaac Newton
topic: Properties of Sound and Light
grade: 9
subject: Physics
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character: Thomas Young
topic: Interference of Sound Waves
grade: 9
subject: Physics
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character: John Wallace
topic: Theory of Vibrations and Waves
grade: 9
subject: Physics
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