Calculate for the orthorhombic crystal structure of SrRuO3 the angle between the [102]-direction and the (102)-plane (a = 0.553 nm, b = 0.557 nm and a = 0.785 nm). [6 points] Sketch the effective mass corresponding to the dispersion relation shown in the figure below (incl. all intermediate steps) () k Write down the (explicit) dispersion relation for electrons near the conduction band minimum in GaAs and near one of the conduction band minima in Si. [6 points]