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Problem P. 3942. (December 2006)

P. 3942. A lab animal is injected with a solution which contains a radioactive isotope of half-life 15 h. The activity of the solution is 2100 Bq. 5  hours later a sample of blood is taken from the animal and it was found that the activity of 3 cm3 of the animal's blood is 0.25 Bq. How many liters of blood does the animal have if during the elapsed five hours half of the solution was absorbed by its body?

(4 pont)

Deadline expired on January 11, 2007.


95 students sent a solution.
4 points:80 students.
3 points:5 students.
2 points:10 students.

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