Lead contained in a vacuum is illuminated with light from a laser, causing electrons to be emitted from the surface of the metal. Lead has a work function of 4.25 eV. The maximum kinetic energy of the electrons is 4.03 eV. What frequency of light does the laser emit? Use a value of eV⋅s for the value of the Planck constant.
A polished metal surface in a vacuum is illuminated with light from a laser, causing electrons to be emitted from the surface of the metal. The light has a frequency of Hz. The work function of the metal is 1.40 eV. What is the maximum kinetic energy that the electrons can have? Use a value of eV⋅s for the Planck constant. Give your answer in electron volts.
A 20.0 mW laser that produces 250 nm light is used to illuminate a block of silver. This causes electrons to be ejected from the surface of the silver. If all of the photons produced by the laser each eject one electron from the silver, what is the total current of the photoelectrons? Silver has a work function of 4.26 eV. Use a value of eV⋅s for the Planck constant and a value of C for the charge of one electron. Give your answer to 3 significant figures.