Problem P. 3908. (September 2006)
P. 3908. A solar furnace is a huge concave mirror which is always turned towards the Sun. A piece of metal, which is to be melted, is placed to the focus of the mirror. What can be the greatest temperature at the focus of the solar furnace?
Deadline expired on October 11, 2006.
Sorry, the solution is available only in Hungarian. Google translation
Megoldás. Elvben legfeljebb a Nap felszíni hőmérséklete, 6000 K. Ténylegesen ennél kisebb hőmérséklet (kb. 4000 K) érhető el.