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OpenStudy (anonymous):
Which of the following is a true statement? A. Electromagnetic waves consist of only changing electric fields. B. Electromagnetic waves are longitudinal waves. C. Electromagnetic waves do not always need a medium to travel. D. Electromagnetic waves can vary in speed, wavelength and frequency.
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OpenStudy (anonymous):
option D..
OpenStudy (anonymous):
i think it is C
OpenStudy (anonymous):
Electromagnetic waves can travel in vacuum
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