Mathematical and Physical Journal
for High Schools
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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