character: Dr. Johnson
topic: The Impact of Doppler Effect on Sound Waves
grade: 11
subject: Physics
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character: Ms. Smith
topic: Understanding Sound Waves and Their Properties
grade: 11
subject: Physics
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character: Mr. Brown
topic: Applications of the Doppler Effect in Astronomy
grade: 11
subject: Physics
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character: Mrs. Taylor
topic: How Movement Affects Sound Frequency
grade: 11
subject: Physics
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