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Question 9: NCERT Solutions for 12th Class Physics: Chapter 13-Nuclei
Obtain the amount of 
necessary to provide a radioactive source of 8.0 mCi strength. The half-life of
is 5.3 years.
Solution:
Here rate of disintegration required
As 1 mole i.e., 60 g of cobalt contains 6.023 × 1023 atoms, so, the mass of cobalt required for given rate of disintegration
Check the complete chapter with solutions.
NCERT Solutions for 12th Class Physics: Chapter 13-Nuclei