An alpha particle (which is a helium nucleus, q=+2e, m=6.64×10−27kg) is emitted in a radioactive decay with ke = 5.63 mev .

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An alpha atom (which is a helium core, q=+2e, m=6.64×10−27kg) is emitted in a radioactive decline after a while ke = 5.63 mev .
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Source embody