A depletion-layer detector has an electrical capacitance determined by the thickness of the insulating dielectric. Estimate the capacitance of a silicon detector with the following characteristics: area 1.5 cm2, dielectric constant 10, depletion layer 40µm. What potential will be developed across the capacitance by the absorption of a 5.0 MeV alpha particle which produces one ion pair for each 3.5 eV dissipated?