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Physics 15 Online
OpenStudy (anonymous):

Which of the following is a true statement? A. Electromagnetic waves are longitudinal waves. B. Electromagnetic waves do not always need a medium to travel. C. Electromagnetic waves can vary in speed, wavelength and frequency.

OpenStudy (sidsiddhartha):

Electromagnetic waves such as radio waves, light, x rays, gamma rays do not need any medium to propagate so B is true

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