Dc output of a r928 pmt a 400-nm dc light uniformly illuminates the photocathode of a hamamatsu r928 pmt. the photon irradiance is 10" photons per m' per s. the pmt is operated under iypicaldconditions. 12 question 1: what is the incident radiant power (in w) at the photocathode of the pmt?question 2: what is the resulting cathode current (in a)? answer question 3: what is the resulting anode current (in a)? answer question 4: it is desired that the anode current be reduced to 20 ha by decreasing the gain. what is the new gain setting and the corresponding supply voltage (in v)?