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P. 4183. The halflife of the radioactive isotope of lead, whose atomic mass number is 214, is 26.8 minutes. How long has it been decaying if only one-thousandth of the original atoms are present in the sample?

(4 points)

Deadline expired on 12 October 2009.

Google Translation (Sorry, the solution is published in Hungarian only.)

Megoldás. 267 perc, azaz kb. 4,5 óra.

Statistics on problem P. 4183.
 143 students sent a solution. 4 points: 121 students. 3 points: 13 students. 2 points: 3 students. 1 point: 3 students. 0 point: 2 students. Unfair, not evaluated: 1 solution.

• Problems in Physics of KöMaL, September 2009

•  Támogatóink: Morgan Stanley