Mathematical and Physical Journal
for High Schools
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Problem P. 4022. (November 2007)

P. 4022. Protons of kinetic energy 5.00 MeV are scattered totally elastically on the nuclei of an unknown element of negligible speed. The protons are deflected by 90o and their kinetic energy is 4.23 MeV.

a) What is the mass of the nuclei and what kind of chemical element's nuclei are they?

b) What is the direction of the motion of these nuclei with respect to the direction of the motion of the incident protons?

(5 pont)

Deadline expired on December 11, 2007.


Statistics:

67 students sent a solution.
5 points:Almási 270 Gábor András, Balassa Péter, Bedics Gábor, Berta Katalin, Börcsök Bence, Budai Ádám, Csató Bertalan, Csengeri Béla, Csige Péter, Deli Gábor, Demeter Dániel, Énekes Péter, Filep Tibor, Fonyó Dávid, Földes Tamás, Guszejnov Dávid, Halász Máté, Hartstein Máté, Hegyi Ádám, Jakab Dávid, Kalina Kende, Kispéter Tamás, Kovács 235 Gábor, Kovács 915 István, Kovács Attila, Krämer Zsolt, Lajtai Gergő, Lénárt Tamás, Lovas Lia Izabella, Maknics András, Marák Károly, Nagy 648 Donát, Pásztor Ádám Viktor, Pázmán Koppány, Rárósi Dávid, Subhrashis Guha Niyogi, Szikszay László, Szük Dániel, Tolnai Gábor, Tolner Ferenc, Tószegi Károly, Tóth 123 László, Varga 777 Ádám, Velicsányi Péter, Vida György.
4 points:10 students.
3 points:8 students.
2 points:1 student.
1 point:1 student.
0 point:2 students.

Problems in Physics of KöMaL, November 2007