Mathematical and Physical Journal
for High Schools
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Problem P. 4031. (December 2007)

P. 4031. A positron of speed v=0.6\, c, collides with an electron which was initially at rest, and they annihilate. One of the created photon travels perpendicularly to the original direction of the velocity of the positron.

a) In what direction is the other photon emitted?

b) What is the ratio of the energies of the two photons?

(5 pont)

Deadline expired on January 11, 2008.


Statistics:

53 students sent a solution.
5 points:Adrián Patrik, Almási 270 Gábor András, Bőle Pál, Csató Bertalan, Deák Zsolt, Deli Gábor, Filep Tibor, Fonyó Dávid, Földes Tamás, Gál Bálint, Hartstein Máté, Hlatky Dávid, Krämer Zsolt, Lajtai Gergő, Ölvedi Tibor, Pázmán Koppány, Rácz Viktor, Schlarb Krisztián, Szikszay László, Szolnoki Lénárd, Szük Dániel, Tolnai Gábor, Tolner Ferenc, Tóth 123 László, Túri Attila, Varga 777 Ádám, Vőfély Róza Villő.
4 points:Fodor Tibor, Gulyás Máté, Hományi Ádám, Kardos Örs, Nagy 648 Donát.
3 points:7 students.
2 points:5 students.
1 point:6 students.
0 point:3 students.

Problems in Physics of KöMaL, December 2007