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19. (book 1-17) A household light bulb is a blackbody radiator. Many light bulbs use tungsten filaments that are heated by an electric current. What temperature is needed so that Amax = 550 nm? 20. (book 1-18) The threshold wavelength for potassium metal is 564 nm. What is the work function? What is the kinetic energy of electrons ejected if radiation of wavelength 410 is used? 21. (book 1-25) A line in the Lyman series of hydrogen has a wavelength of 1.03x10-7 m. Find the original energy level of the electron. (hint, see page 21). 22. (book 2-1). Find the general solutions to the following differential equations: d' y a. dy +3y=0 dx2 dx b. d'y +6 dy =0 dx2 dx