JEE Main2019Physics
Q.
A sample of radioactive material A, that has an activity of 10 mCi (1 Ci = 3.7 × 1010 decays/s),has twice the number of nuclei as another sample of a different radioactive material B which has an activity of 20 mCi. The correct choices for half-lives of A and B would then be respectively :
- A
20 days and 5 days
- B
20 days and 10 days
- C
5 days and 10 days
- D
10 days and 40 days
Solution
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