A) \[\alpha \] then\[\beta \] and then\[\gamma \]emitted
B) \[\alpha \] or \[\beta \] and then\[\gamma \]emitted
C) \[\alpha \]and\[\beta \] and \[\gamma \]emitted simultaneously
D) \[\alpha \]and\[\beta \]emitted simultaneously
Correct Answer: B
Solution :
Key Idea: Radioactive substances emit\[\alpha ,\beta \] and \[\gamma \]rays. \[\alpha \]and\[\beta \]particles are charged particles \[\gamma -\]rays are energy particles \[\therefore \] \[\alpha \]and \[\beta \]decay is followed by y-emission.
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