The of type of particle is most likely being described when particular fast-moving particle travels several feet in open air and is easily stopped by a solid material is Beta particles.
What are Beta particles?
Beta particles can be described as the high energy having high speed electrons (β-) which is been moved from nucleus during radioactive decay.
Therefore, Beta particles is a type of particle is most likely being described when particular fast-moving particle travels several feet in open air.
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