In: Physics
a.A simple system has two states with energies 2E and 4E. What is the canonical partition function of the system at temperature T, if E = kT? (Hint: the canonical partition function applies when the chemical potential, μ = 0.)
b.Consider a gas containing 4.0 × 104 rubidium atoms, each of mass 1.5 × 10-25 kg, confined to a volume of 2.5 × 10-14 m3. To what temperature must it be cooled for the effects of indistinguishability to be ignored for this gas?
c.In an X-ray diffraction experiment, X-rays with wavelength 0.250 nm are scattered from a substance. At what angle will the n = 3 reflection be observed, if the spacing between the scattering planes is 0.650 nm?
d.Aluminium has a valency of 3, a density of 2.7 × 103 kg m−3 and a relative atomic mass of 27. What is the number density of free electrons in aluminium?
e.Silver has an electron number density of 5.9 × 1028 m-3. According to Drude’s theory what is the drift speed of the electrons in a silver wire of diameter 0.25 mm when a current of 5.0 A flows in it?
f.Copper has a Fermi energy of 7.02 eV. What is its electron number density?
g.Silver has an electron number density of 5.9 × 1028 m−3. If a sample of silver is at a temperature such that kT is 1% of its Fermi energy, what is its temperature?