Photomultiplier tubes {PMTs) are used in many instruments that need to measure very small amounts of light. These PMTs use the photoelectric effect to detect single photons of light. A common design is to have the detector metal sitting at the end of along tube. Light hitting the detector can release electrons via the photoelectric effect. A voltage is placed on a series of plates, called dynodes, within the photomultiplier tube, which accelerates the electrons towards each of them successively. The photon kicks a single electron out of the detector which is then accelerated so that when it hits the first dynode it knocks out multiple electrons, each of which knock out more electrons from thes econd dynode, etc., so that by the end of the series of dynodes there is a large pulse of electrons. These can then be detected by a standard ammeter at the end of the photomultiplier tube I'hmoculhmic Photon Elccn'lcnl connccliom You want to manufacture a series of PMTs to sell to customers interested in measuring different wavelengths of light. Which material would you use if you wanted to: Detect only wavelengths of 450.9 nm and shorter? Detect only wavelengths of 450.9 nm and longer? Detect only wavelengths of 289.7 nm and shorter? For many applications, there is a need to detect near IR light. There is a semiconductor alloyGallium Arsenide (GaAs) that can detect light up to wavelengths of 920 nm. What is the work function of this material (in em? .n-o 57.5