IYPT 1989, Задачи на турнира — Задача 13. Electrolytic cell
Problems for the 2nd International Young Physicists’ Tournament
Внимание: Бележка към темата
The original header prints 1988, although this is the 2nd IYPT problem set for 1989; the edition’s note [1] and its bibliography identify the 1989 event. The printed header is retained.
Critical edition
Olympiets Youth Center, Moscow, Soviet Union; March 24‒April 2, 1988 [1]
Critical edition: translated, restored, and commented text [2]
FINAL DRAFT. — Please do not re-publish. Suggestions and criticism welcome
Translated, edited and commented by Ilya Martchenko. The original edition’s historical notes, sources and acknowledgments are retained with problem 1.
Епиграф
Squamps are hunted from the inside only.
S. Lem [3]
Условие
Prepare some saturated solution of table salt NaCl. [22] Immerse two carbon electrodes (sticks from a manganese-zinc battery 373 (R20) [23]) into it [24] so that their metal contacts are not immersed into the solution. Investigate
a. the current-voltage characteristic of the created electrolytic cell in the range of currents from 10 μA to 50 mA; [25]
b. how does the current-voltage characteristic change as the solution is diluted?
Note [21]
A different problem at the Correspondence Round [Kvant 1988]: “Photoflash. Lighten your teeth with a photoflash and observe their glow in the darkness (for that, you have to take off the cover of the camera flash, defend your eyes well, and open them immediately after the flash). Explain and research the phenomenon of afterglow.” In [Jordens 1989], the problem reads: “Photoflash. Illuminate your teeth with a photoflash and observe
their luminescence in the darkness. For this purpose you must remove the cover from the photoflash, close your eyes well and open them just after the flash. Explain the phenomenon of afterluminescence”
Note [22]
The sizes of the reservoir are introduced explicitly specified in the 1996 Czech and in the 2006 English text: “Prepare saturated solution of salt (NaCl) in the tank with sizes: depth 3 cm, width 10 cm, length 15 cm”
Note [23]
The specification “sticks from manganese-zinc element R20” does not appear in the Slovak text. The Hungarian text names it “373 (R20) manganese-zinc element”
Note [24]
The 1996 Czech and the 2006 English text introduce and specify the distance of 4 cm between the electrodes
Note [25]
“From 10 μA to 50 μA”, according to the Hungarian and the 2006 English text
Решение
Внимание: Непълно решение
В архива няма официално решение на тази задача.
Оригинал в Архива: 1989.pdf