Problem One (10 points) I. Why we are using statistical mechames to study the physical properties of an assembly? 2. At what condition the particles in assembly consider indistinguishable. 3. In Maxwell-Boltzmann distribution the multiplier B should be negative, discuss this fact. 4. Why the average velocity of a system in assembly at thermal equilibrium is zero? 5. What is the physical meaning of the number of microstates