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Light or radioactive particles. They uses electro magnetic radiation as a medium for them to travel through, Waves like sound can not travel through vacuum because they need physical mediums like air.

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βˆ™ 2011-03-09 05:28:14
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Physics

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Which term explains whether an object's velocity has increased or decreased over time

Which of these is a characteristic of nonmetals

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Q: What can travel in a vacuum?
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