Mathematical and Physical Journal
for High Schools
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# Problem P. 4855. (May 2016)

P. 4855. Nitrogen-13 is a radioisotope of Nitrogen. Its half life is 10 minutes. The initial number of the nuclei of the isotope $\displaystyle {}^{13}\rm N$ is $\displaystyle N$.

$\displaystyle a)$ How many nuclei decays during 20 minutes if $\displaystyle N=10^{10}$?

$\displaystyle b)$ What can be stated about the number of decaying nuclei during 20 minutes if $\displaystyle N=4$?

(5 pont)

Deadline expired on June 10, 2016.

### Statistics:

 45 students sent a solution. 5 points: Asztalos Bogdán, Balogh Menyhért, Csire Roland, Csorba Benjámin, Csuha Boglárka, Di Giovanni András, Elek Péter, Fajszi Bulcsú, Fehér 169 Szilveszter, Fekete Balázs Attila, Forrai Botond, Iván Balázs, Jakus Balázs István, Kormányos Hanna Rebeka, Kovács Péter Tamás, Körmöczi Dávid, Krasznai Anna, Németh Flóra Boróka, Nenezic Patrick Uros, Olosz Adél, Pataki 245 Attila, Sal Kristóf, Szántó Benedek, Tófalusi Ádám. 4 points: Ghada Alshalan, Szentivánszki Soma . 3 points: 7 students. 2 points: 11 students. 1 point: 1 student.

Problems in Physics of KöMaL, May 2016