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Biology 13 Online
OpenStudy (anonymous):

In your own words, explain why light can travel with or without a medium.

OpenStudy (stephstar101):

Electromagnetic waves (visible light is one) can travel with no medium because it has tiny electric and magnetic fields that vibrate instead any material vibrating (like how sound uses air, water, etc.) When light travels through a medium like air, electric and magnetic fields are the ones still vibrating, but the particles in the air actually slow down the light slightly.

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