9:56 AM
5

Here is a very simple question about light. As far as I remember from the school program, each color is merely one of the frequencies of light. I also remember that each color's wave length is different. On the other hand, when talking about the speed of light, I've always heard only one value. W...

12 hours later…
9:40 PM
2

In free expansion the system is thermally isolated so $\Delta Q = 0$ throughout the process. This implies that process is adiabatic and follows its equation: $$P_1V_1^\gamma = P_2 V_2^\gamma$$ But since inital and final temperature is same $$P_1 V_1 = P_2 V_2$$ Both equations can only hold w...