Two rigid boxes containing different ideal gases are placed on a table. Box A contains one mole of nitrogen at temperature To, while box B contains one mole of helium at temperature (7/3)To. The boxes are then put into thermal contact with each other and heat flows between them until the gases reach a common final temperature (Ignore the heat capacity of boxes). Then, the final temperature of the gases, Ts, in terms of To is 1) Tg = 1/2 T 2) Tg = 1 2 3 To 3) Is = 2 3 10 4) Tg = 2 3 10 im