character: Mr. Wilson
topic: Refraction and Reflection of Sound Waves
grade: 11
subject: Physics
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character: Dr. Smith
topic: Wave Properties and Phenomena
grade: 11
subject: Physics
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character: Ms. Johnson
topic: Applications of Sound Waves in Technology
grade: 11
subject: Physics
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character: Mr. Adams
topic: Interference and Diffraction of Waves
grade: 11
subject: Physics
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