Question 2 (25 points total) You are performing a UV light absorption measurement at 300 nm on a crudely con- structed home-built UV-VIS instrument. You prepare a solution containing an analyte with a concentration of 1 mM. in a 1 cm cuvette. The analytes extinction coefficient at 300 nm is 100 M1 cm1. Please answer the following questions below: (a) What is the optical density of the sample at = 300 nm? Show all work for full credit. (5 points) (b) To perform the measurement, you use 10 mW of 300 nm light. What light source are you most likely employing to generate this light? What is the radiant power of the light that transmits through the sample? Show all work for full credit. (5 points) (c) You are using a photodiode to detect the transmitted light. Whatmost likelyis the detection material composed of? (5 points) (d) Below is the responsivity curve of your detector. What is the expected photocurrent generated from your signal? In answering this question, derive an expression for the photocurrent as a function of wavelength. Show all work. (5 points)

Figure 1: Responsivity curve of your detector. (e) You convert the photocurrent signal into a voltage signal using a 50 load. What is the voltage signal that you measure? Show all work for full credit (5 points)

SM05PD7A Photodiode Resbonsivitv