Recent content by Kweh-chan

  1. K

    Reversible adiabatic expansion using Van der Waals' equation

    Homework Statement A real gas obeys Van der Waals‟ equation, which for one mole of gas is (p + A/V2)(V-B) = RT and its internal energy is given by U = CvT - A/V where the molar heat capacity at constant volume, Cv , is independent of the temperature and pressure. Show that the relation...
  2. K

    Electromagnetism - Potentials due to point charge and along line of of charge

    Homework Statement Consider an infinitely long and thin line of charge, with density 8nC/m. Calculate the electric potential difference ((phi)1-2) between two points in air at radial disances 1mm and 3mm.Homework Equations I am assuming: Phi(r) = λ/2(pi)ε0 * ln(rR/r) where rR is a reference...
  3. K

    Linewidth of emission and the uncertainty principle

    Homework Statement The linewidth of a certain fluorescing dye molecule is 60nm and the peak emission wavelength is 600nm. The lifetime of the dye molecule in the excited state is 1ns. Determine whether the linewidth of the emission is a result of the uncertainty principle. (it may be helpful...