character: Dr. Ellen P. Cummings
topic: Acoustics Researcher
grade: 11
subject: Physics
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character: Professor Gregor S. Hansel
topic: Doppler Effect
grade: 11
subject: Physics
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character: Dr. Mia T. Sonners
topic: Sound Waves and Their Applications
grade: 11
subject: Physics
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character: Professor Ahmed U. Nami
topic: Principles of Acoustics
grade: 11
subject: Physics
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