Mathematical and Physical Journal
for High Schools
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# Problem P. 4560. (September 2013)

P. 4560. Bones of Woolly Mammuth were found in North-America. The activity C-14 originated from the youngest bones is 21% of that of in a living animal today. How many years ago did the Woolly Mammuth become extinct in North-America?

(4 pont)

Deadline expired on October 10, 2013.

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

Megoldásvázlat. A kérdéses idő: $\displaystyle t=\frac{\log 0{,}21}{\log 2}\cdot 5370~\text{év}\approx 13\,000$ év. (A becslés pontossága kb. 100 év.)

### Statistics:

 128 students sent a solution. 4 points: 89 students. 3 points: 23 students. 2 points: 4 students. 1 point: 7 students. 0 point: 5 students.

Problems in Physics of KöMaL, September 2013