, has twice the number of nuclei as another sample of different radioactive material B which has an activity of 
. The correct choices for half-lives of A and B would then be respectively: [JEE Main 09-Jan-2019 Morning]
A) 10 days and 40 days
B) 20 days and 10 days
C) 5 days and 10 days
D) 20 days and 5 days
Correct Answer: D
Solution :
[d]  |
 |
 |
| Ratio of half-life for A arid B is 4 : 1 |
| So, option [d] is correct. |
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