character: Mr. Johnson
topic: Electromagnetic Spectrum
grade: 9
subject: Physics
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character: Mr. Johnson
topic: Wave Properties of Light
grade: 9
subject: Physics
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character: Mr. Johnson
topic: Applications of Electromagnetic Waves
grade: 9
subject: Physics
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character: Mr. Johnson
topic: Frequency and Wavelength in the Electromagnetic Spectrum
grade: 9
subject: Physics
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