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30/12/2020 10:47 am
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An a-particle contains
(a) 4 positive charge and 2 mass unit
(b) 2 positive charge and 4 mass unit
(c) 2 positive charge and 2 mass unit
(d) 4 positive charge and 4 mass unit
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30/12/2020 10:48 am
(b) 2 positive charge and 4 mass unit