Asample semiconductor has a cross-sectional area of 1 cm and a thickness of 0.2 cm. five watts of electromagnetic radiation at a wavelength of 6200 angstroms are incident on this material. assume that 80% of the photons are successful in generating an electron-hole pair. determine the number of electron-hole pairs generated per unit volume per unit time.

The air in an automobile tire with a volume of 2.60 ft3 is at 70°f and 21 psig. determine the amount of air that must be added to raise the pressure to the recommended value of 30 psig. assume the atmospheric pressure to be 14.6 psia and the temperature and the volume to remain constant. the gas constant of air is ru = 53.34ft⋅lbflbm⋅r(1 psia144 lbf/ft2) = 0.3704 psia⋅ft3lbm⋅r the amount of air that must be added to raise the pressure is lbm