Two rigid boxes containing different ideal gases are placed on a table. Box A contains one mole of nitrogen at temperature T o , while Box B contains one mole of helium at temperature 7/3 T o . The boxes are then put into thermalcontact with each other and heat flowsbetween them until the gases reach a common final temperature. (Ignore the heat capacity of boxes). Then the final temperatures of the gases, T f in terms of T o is 1) T f = 5/2 T o 2) T f = 3/7 T o 3) T f = 7/3 T o 4) T f = 3/2 T o

Two rigid boxes containing different ideal gases are placed on a table. Box A contains one mole of nitrogen at temperature T_o, while Box B contains one mole of helium at temperature 7/3 T_o.  The boxes are then put into thermalcontact with each other and heat flowsbetween them until the gases reach a common final temperature.  (Ignore the heat capacity of boxes).  Then the final temperatures of the gases, T_f in terms of T_o is

1) T_f = 5/2 T_o     2)  T_f= 3/7 T_o     3) T_f = 7/3 T_o  4) T_f  =  3/2 T_o