Mathematical and Physical Journal
for High Schools
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# Problem P. 4191. (October 2009)

P. 4191. A sample of Helium gas is cooled down at a pressure of 105 Pa. The gas gives off 5 kJ heat. By how many litres did the volume of the gas decrease?

(4 pont)

Deadline expired on November 10, 2009.

Sorry, the solution is available only in Hungarian. Google translation

Megoldás. $\displaystyle \Delta V=\frac{2Q}{5p_{0}}=0{,}02\,{\rm m^3}=20\,$liter.

### Statistics:

 155 students sent a solution. 4 points: 105 students. 3 points: 20 students. 2 points: 6 students. 1 point: 3 students. 0 point: 10 students. Unfair, not evaluated: 11 solutionss.

Problems in Physics of KöMaL, October 2009