character: Mr. Thompson
topic: Sound Waves and Their Properties
grade: 11
subject: Physics
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character: Mrs. Collins
topic: Reflection of Sound Waves
grade: 11
subject: Physics
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character: Dr. Williams
topic: Principles of Echo in Physics
grade: 11
subject: Physics
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character: Professor Green
topic: Interference and Absorption of Sound Waves
grade: 11
subject: Physics
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