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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/highschool-physics/x6679aa2c65c01e53:electromagnetic-radiation/x6679aa2c65c01e53:wave-behaviors-of-em-radiation/e/apply-electromagnetic-waves Want to explore more? Check out the full electromagnetic radiation ...
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