character: David Lee
topic: Real-World Applications of Sound Waves
grade: 9
subject: Physics
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character: Albert Einstein
topic: The Doppler Effect
grade: 9
subject: Physics
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character: Marie Curie
topic: Ultrasound Imaging in Medicine
grade: 9
subject: Physics
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character: Isaac Newton
topic: Reflection and Refraction of Sound Waves
grade: 9
subject: Physics
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