Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
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Problem P. 4669. (October 2014)

P. 4669. Uranium-238 is an alpha-decaying isotope, its half-life is 4.5-billion years. How many atoms are there in that Uranium block in which on average one atom decays in each

\(\displaystyle a)\) second;

\(\displaystyle b)\) hour;

\(\displaystyle c)\) day;

\(\displaystyle d)\) year?

(4 pont)

Deadline expired on November 10, 2014.


Statistics:

84 students sent a solution.
4 points:56 students.
3 points:8 students.
2 points:3 students.
1 point:5 students.
0 point:12 students.

Problems in Physics of KöMaL, October 2014