Question

The nuclide $$^{131}I$$ is radioactive, with a half-life of $$8.04$$ days. At noon on January $$1$$, the activity of a certain sample is $$60089$$. The activity at noon on january $$24$$ will be

Answer 1

Correct option is C. More than $$75\ Bq$$
Number of days from January $$1^{st}$$ to January $$24^{th}=23$$ days.Number of half lives $$n=\dfrac{23}{8.04}=2.86 (< 3)$$
In three half lives activity becomes $$75\ Bq$$, but the given number of half lives are lesser than $$3$$ so activity becomes greater than $$75\ Bq$$