character: Mrs. Brown
topic: Sound Waves and Their Properties
grade: 11
subject: Physics
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character: Mrs. Johnson
topic: Wave Reflection and Refraction
grade: 11
subject: Physics
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character: Mr. Smith
topic: Wave Interference and Diffraction
grade: 11
subject: Physics
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character: Dr. Lee
topic: Applications of Sound Waves
grade: 11
subject: Physics
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