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What makes up (composition) of beta particle

User Maxpolk
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Answer:

Step-by-step explanation:

Beta particles have a mass which is half of one thousandth of the mass of a proton and carry either a single negative (electron) or positive (positron) charge. As they have a small mass and can be released with high energy, they can reach relativistic speeds (close to the speed of light).

User DaWilli
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