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Since electromagnetic waves are transverse waves, this means that

A.
the speed at which they travel through air must be equal to the speed at which they travel through glass.
B.
the direction of their oscillation must be parallel to the direction of wave motion.
C.
the direction of their oscillation must be perpendicular to the direction of wave motion.
D.
the speed at which they travel through a vacuum must be equal to the speed at which they travel through air.

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Since electromagnetic waves are transverse waves, this means that
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