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 \[\gamma -\]emission.
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