Mathematical and Physical Journal
for High Schools
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Problem P. 3955. (February 2007)

P. 3955. There are two samples of gas in a thermally insulated cylinder. One of them is Argon at a temperature of 300 K, and the other is Nitrogen at a temperature of 400 K. There is a thermally insulated wall between them. The two gases have the same pressure and the same volume. Then the wall between the gases is taken away, and the two gases mix.

a) Does the energy of the system change?

b) What will be the common temperature?

c) How does the pressure change?

d) Does the entropy of the system change?

(5 pont)

Deadline expired on March 12, 2007.


112 students sent a solution.
5 points:54 students.
4 points:29 students.
3 points:9 students.
2 points:4 students.
1 point:8 students.
0 point:7 students.
Unfair, not evaluated:1 solution.

Problems in Physics of KöMaL, February 2007