character: Mr. Williams
topic: Sound Waves and Their Properties
grade: 11
subject: Physics
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character: Ms. Johnson
topic: Frequency and Wavelength in Sound Waves
grade: 11
subject: Physics
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character: Dr. Smith
topic: The Doppler Effect and Its Applications
grade: 11
subject: Physics
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character: Mrs. Adams
topic: Reflection and Refraction of Sound Waves
grade: 11
subject: Physics
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