Which of the following statements are true concerning electromagnetic waves in a vacuum? Check all that apply
Electromagnetic waves travel in a vacuum with a definite and unchanging speed.
Electromagnetic waves can travel in a vacuum only because a medium prohibits the forward propagation of the electric and magnetic fields.
When electromagnetic waves travel in vacuum, there is a definite, constant ratio between the magnitudes of the electric and magnetic fields.
Electromagnetic waves traveling in a vacuum are longitudinal waves
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