Work Function and Photon Momentum Questions As you complete each problem, be sure to indicate variables and equations used. You may find it helpful to use the GRASP method. Keep in mind that as an assignment progresses, the difficulty generally increases. You will notice the same trend from one assignment to the next in a given unit. Also remember to take an inventory of what criteria are being used to assess each question. Best of luck with the following questions and always remember to ask for help if you get stuck after consulting your notes! 1. The work function for a nickel surface is 5.15 eV. [5 marks] a.) What is the minimum frequency of the radiation that will just eject an electron from the surface? b.) What is the general name given to this minimum frequency? 2. The longest wavelength of light that will just eject electrons from a particular surface is 428.7 nm. What is the work function of this surface? [4 marks] 3. When ultraviolet radiation was used to eject electrons from a lead surface, the maximum kinetic energy of the electrons emitted was 2.0 eV. What was the frequency of the radiation used? [5 marks] 4. The electrons emitted from a surface illuminated by light of wavelength 460 nm have a maximum speed of 4.2x105 m/s. Given that an electron has a mass of 9.11x10'31 kg, calculate the work function (in eV) of the surface material. [5 marks] 5. Assume that a particular 40.0 W light bulb emits only monochromatic light of wavelength 582 nm. If the light bulb is 5.0% efficient in converting electrical energy in light, how many photons per second leave the light bulb? [6 marks] 6. Calculate the momentum of a photon with a wavelength of 560 nm. [3 marks] 7. Calculate the momentum of a photon with an energy of 186 eV. [3 marks] 8. What is the momentum of a microwave photon if the average wavelength of microwaves is approximately 12 cm? [4 marks]