cse • paper_2 • nuclear_particle
[UPSC CSE 1999] Nuclear Physics (Q190, 20M)
The specific activity of a sample containing radioactive \text{Co}^{58} and non-radioactive \text{Co}^{59} was observed to be 2.2 \times 10^{12} disintegrations per second per gm. Half-life of \text{Co}^{58} is 71.3 days. Find the percentage of mass of radioactive element in the sample.
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