Dual Nature, Atoms & Nuclei · JEE Main previous year questions

2016 1 question

1. Q602016 · 3 Apr 2016 · Shift 1

   Half-lives of two radioactive elements $A$ and $B$ are $20\mathrm{minutes}$ and $40\mathrm{minutes}$, respectively. Initially, the samples have equal number of nuclei. After 80 minutes, the ratio of decayed number of $A$ and $B$ nuclei will be:

   1. A.$1:4$
   2. B.$5:4$
   3. C.$1:16$
   4. D.$4:1$
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   Answer: B