character: Galileo Galilei
topic: Studying Sound Waves
grade: 11
subject: Physics
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character: Isaac Newton
topic: Theory of Sound Propagation
grade: 11
subject: Physics
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character: Robert Hooke
topic: Vibrations and Sound
grade: 11
subject: Physics
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character: Thomas Young
topic: Wave Theory of Light and Sound
grade: 11
subject: Physics
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