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Kinetic theory of ideal gases

Question

A light container having a monoatomic ideal gas enclosed within is moving with  speed v1. Its speed is suddenly reduced to  v2. Find the resulting change in  temperature. (Mass of each molecule of gas = m, k = Boltzmann  constant).

Moderate
Solution

Loss in kinetic energy of container is converted to random motion of molecules. 
12mv1212mv22=32kΔT   
(Since monoatomic gas has three degrees of freedom).
ΔT=mv12v223k 
 



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