character: Professor Echo
topic: Sound Wave Propagation
grade: 11
subject: Physics
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character: Professor Sound
topic: Properties of Sound Waves
grade: 11
subject: Physics
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character: Professor Wave
topic: Longitudinal and Transverse Waves
grade: 11
subject: Physics
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character: Doctor Vibration
topic: Frequency and Amplitude in Sound
grade: 11
subject: Physics
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