character: Mr. Johnson
topic: Understanding Sound Wave Properties
grade: 9
subject: Physics
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character: Mr. Johnson
topic: Frequency and Amplitude of Sound Waves
grade: 9
subject: Physics
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character: Mr. Johnson
topic: Speed of Sound in Different Media
grade: 9
subject: Physics
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character: Mr. Johnson
topic: Applications of Sound Waves in Technology
grade: 9
subject: Physics
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