Question
A container is divided into 2 equal parts 1 and 2 by a partition with a small hole of diameter d. The 2 partitions are filled with same ideal gas , but held at different temperatures T1=150K, T2= 300K by connecting to 2 heat reservoirs . If l1 and l2 are mean free paths in the two parts such that d>>l1 and d>> l2 ,find l1/ l2.