A photoconductive cell is composed of a CDs crystal 1 mm length, 1 mm width, and 0.1 mm thickness it ends in electrical contacts where the crystal has an illuminated surface of 1mm2 and contacts 0.1 mm2
the cell is illuminated with blue light with a wavelength of 450 nm and a density of 1 MW / cm2 knowing that the energy gap is 2.6 ev and the lifetime of unbalanced carriers is 1 ms find

 a) the number of carrier generation rate 

b) the photoconductivity of the crystal 

C) current passing through it if 50 V voltage is applied