Mathematical and Physical Journal
for High Schools
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Problem P. 4473. (October 2012)

P. 4473. 0.06 mass percent of the human body is potassium, and 0.012% of this is the potassium isotope of atomic mass number 40. This isotope is radioactive, it \beta decays, and its half life is 1.3 miliard years. How many \beta decays occur in each second in the body of a 60-kg man due to the potassium in the human body?

(4 pont)

Deadline expired on November 12, 2012.

Sorry, the solution is available only in Hungarian. Google translation

Megoldásvázlat. Kb. 1100 bomlás/s.


128 students sent a solution.
4 points:67 students.
3 points:33 students.
2 points:11 students.
1 point:17 students.

Problems in Physics of KöMaL, October 2012