NEET 2009 Physics question

The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter is an:

(1)isomer of parent
(2)isotone of parent
(3)isotope of parentCorrect
(4)isobar of parent

Answer: (3)

Solution

Let n alpha particles and 2n beta () particles be emitted. Each alpha decreases Z by 2 and A by 4; each beta increases Z by 1 and leaves A unchanged. Net change in Z: ; net change in A: . The daughter

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Question ID VK-090151