Answer :
Final answer:
Without the specific concentration of polonium-212 (212Po) and its half-life, it is impossible to calculate the activity of 212Po in the rock containing thorium-232 (232Th).
Explanation:
The activity of a sample of radioactive material depends on the number of undecayed nuclei and the half-life of the isotope in question. In this case, the rock contains 10.1 g of thorium-232 (232Th). To calculate the activity of polonium-212 (212Po) within the same rock, we would need to know the amount of 212Po present which could be determined by the decay chain from 232Th, and its half-life. However, without information on the concentration of 212Po and its specific half-life, a direct calculation of activity cannot be made. In a general scenario, decay products like 212Po are continuously produced and decayed in a rock that contains a parent isotope such as 232Th.
