13) What is the maximum speed of an electron stopped by a cutoff potential of 3.1 V? (ANSWER: 1.0 x 106 m/) Element Work Function 14) Light of wavelength of 243 nm is just able to produce photoelectrons when striking a surface. Using the table of work functions to the left, what is the Assigned (ev) identity of the surface used? (ANSWER: Selenium) Aluminium 4.08 15) Blue light of wavelength 410 nm strikes a cesium surface. What is the energy ewo... of the emitted photoelectrons? (ANSWER: 0.932 eV) Beryllium 5.00 16) What is the threshold frequency for cadmium? (ANSWER: 9.8 x 10 4 Hz) Cadmium 4.07 17) What is the wavelength of photons capable of producing photoemission from Calcium 2.90 copper and what part of the electromagnetic spectrum would these photons Carbon come from? (ANSWER: 263 nm , UV light) 4.81 18) Determine the maximum speed of electrons emitted from an aluminum Cesium 2.10 surface if the surface was illuminated with 125 nm UV light. Copper 4.70 (ANSWER: 1.44 x 105 m ) Magnesium 3.68 19) Construct a graph of Kinetic Energy versus Frequency using the data below. . .. What is the work function of this theoretical metal and threshold frequency? Mercury 4.50 (ANSWER: 0.44 eV ; 10 4 Hz) Potassium 2.30 Wavelength (nm) Kinetic Energy (ev) Selenium 5.11 500 0.36 Sodium 2.28 490 0.41 Zinc 4.33 440 0.70 390 1.05 340 1.52 290 2.14 240 3.0252 P4 - SPH4U SPH4U a 2022b MODERN PHYSICS WORKSHEET 1) What is the frequency of a 10 nm photon? (ANSWER: 3x1016 Hz) HomeW 2) What is the energy of a 10 nm photon? (ANSWER: 2 x10-17 J ) 3) What is the wavelength of a photon of energy 15 ev? (ANSWER: 82.9 nm ) Assigned Chris Shortreed . 4) What is the energy, in ev of a 400 nm photon? (ANSWER: 3.11 eV ) Homework ld or create . 100 points 5) How many photons of green light (Agreen = 550 nm) are required to deliver 10 J of energy? + (ANSWER: 2.8 x 10" photons )