KöMaL - Mathematical and Physical Journal for Secondary Schools
Hungarian version Information Contest Journal Articles News
Entry form to the contest
Problems and solutions
Results of the competition
Problems of the previous years



Order KöMaL!

Competitions Portal

P. 4052. The window of a room is covered by black paper. There is a square-shaped hole on the paper, through which the red light of the setting sun - nearly perpendicularly - is projected onto the opposite white wall. The distance between the wall and the window is 3.2 m. What is the size and the shape of the light spot on the wall if the area of the square is

a) 1 dm2;

b) 1 mm2;

c) 10-10 m2?

(5 points)

Deadline expired on 11 March 2008.

Statistics on problem P. 4052.
19 students sent a solution.
5 points:Almási 270 Gábor András, Harsányi Szabolcs, Szolnoki Lénárd.
4 points:Gulyás Máté, Győry Erika, Ölvedi Tibor.
3 points:1 student.
2 points:5 students.
1 point:2 students.
0 point:3 students.
Unfair, not evaluated:2 solutions.

  • Problems in Physics of KöMaL, February 2008

  • Our web pages are supported by:   Ericsson   Google   Cognex   Emberi ErőforrĂĄs TĂĄmogatĂĄskezelő   Emberi ErőforrĂĄsok MinisztĂŠriuma  
    OktatĂĄskutatĂł ĂŠs Fejlesztő IntĂŠzet   Nemzeti TehetsĂŠg Program     Nemzeti
KulturĂĄlis Alap   ELTE   Morgan Stanley