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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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Answer:

Electromagnetic waves travel in a vacuum with a definite and unchanging speed.

When electromagnetic waves travel in vacuum, there is a definite, constant ratio between the magnitudes of the electric and magnetic fields.

Explanation:

Electromagnetic waves are waves that come about due to the vibrations generated between an electric field and a magnetic field. There is presence of oscillating magnetic and electric fields and the two statements mentioned above best describes it's properties.

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