(a) Estimate the particle density necessary for bose-Einstein condensation of a hydrogen gas to occur at 100 nK.
(b) what is the ratio of the thermal wavelength to the atom spacing?
1- A mechanically isolated system had a net gain of particles thought its entropy remained the same what cam say about its energy
2- Is possiple to deduce Avogadro number from some measurements of Brownian motion?if so,how? assume the ideal gas constant(R) is independently known
3- say a biologist is unhappy that entropy always seems to increase, and decides to plant some flowers to absorb the heat from sun light will decrease the entropy of covered ground ? if so,have we beaten the second law?