Mathematical and Physical Journal
for High Schools
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Problem P. 4411. (January 2012)

P. 4411. In a sample initially there are equal number of atoms of two radioactive isotopes A and B. Three days later there are 3 times as much nucleides of isotope A than of isotope B, the halflife of which is 1.5 days. What is the half-life of isotope A?

(4 pont)

Deadline expired on February 10, 2012.

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

Megoldás. Kb. 7,2 nap a felezési ideje.


137 students sent a solution.
4 points:105 students.
3 points:3 students.
2 points:4 students.
1 point:15 students.
0 point:9 students.
Unfair, not evaluated:1 solutions.

Problems in Physics of KöMaL, January 2012