IYPT 1991, Задачи на турнира — Задача 14. Moon
Problems for the 4th International Young Physicists’ Tournament
Critical edition
Olympiets Youth Center, Moscow, Soviet Union; July 22‒28, 1991 [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
Is this black currant?
No, it is red currant.
But why is it white?
Because it is still green. [3]
Условие
Determine experimentally the ratio of brightnesses (illuminances) of sunlit and dark sides of the Moon at different lunar phases. [23] Compare them with the theoretical estimations.
Note [22]
Problems “Moon” and “Glider” follow in the opposite order in the 1996 Czech and in the 2006 English text and have there, respectfully, numbers: No. 14 “Glider” and No. 15 “Moon”
Note [23]
An additional detail in parentheses “(full moon, crescent etc.)” appears in the Slovak text
Решение
Внимание: Непълно решение
В архива няма официално решение на тази задача.
Оригинал в Архива: 1991.pdf