character: Mr. John Smith
topic: Waves and Optics
grade: 9
subject: Physics
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character: Mr. John Smith
topic: Sound Waves and Their Properties
grade: 9
subject: Physics
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character: Mr. John Smith
topic: Light Reflection and Refraction
grade: 9
subject: Physics
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character: Mr. John Smith
topic: Interference and Diffraction of Waves
grade: 9
subject: Physics
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