Mathematical and Physical Journal
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# Problem P. 4559. (September 2013)

P. 4559. A pen dosimeter, which contains 5 cm3 air at standard conditions, and which has a capacitance of 1 pF, is charged to 1000 V, initially. What is the absorbed doze, if after the exposure, the voltage drops to 900 V? The average ionization-energy of air is 6.88 aJ and its density is 1.3 kg/m3.

(4 pont)

Deadline expired on October 10, 2013.

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

Megoldásvázlat. 6,6$\displaystyle \cdot 10^{-4}$ Gy. (1 gray = 1 J/kg.)

### Statistics:

 25 students sent a solution. 4 points: Antalicz Balázs, Berta Ádám Iván, Blum Balázs, Büki Máté, Csathó Botond, Csibi Levente, Fekete Panna, Forrai Botond, Horicsányi Attila, Juhász Péter, Krokos Ádám László, Marosvári Kristóf, Németh 017 András, Papp Zoltán, Putti Krisztián, Rózsa Tibor, Seress Dániel, Ványi András. 3 points: Denke Dorottya, Farkas Tamás, Jakovác Gergely. 2 points: 2 students. 1 point: 1 student. 0 point: 1 student.

Problems in Physics of KöMaL, September 2013