character: Dr. Lee
topic: The Doppler Effect and Sound Waves
grade: 11
subject: Physics
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character: Mr. Smith
topic: Understanding Sound Waves And Their Properties
grade: 11
subject: Physics
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character: Ms. Johnson
topic: Applications of The Doppler Effect in Astronomy
grade: 11
subject: Physics
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character: Prof. Brown
topic: Frequency, Wavelength, and Musical Sound Waves
grade: 11
subject: Physics
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