3. Ultraviolet photons enter a metal, ejecting electrons with a maximum speed of 4.6x105 m/s. Electrons have a mass of 9

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3 Ultraviolet Photons Enter A Metal Ejecting Electrons With A Maximum Speed Of 4 6x105 M S Electrons Have A Mass Of 9 1 (24.54 KiB) Viewed 40 times

3. Ultraviolet photons enter a metal, ejecting electrons with a maximum speed of 4.6x105 m/s. Electrons have a mass of 9.11x10-31 kg, and a charge of 1.6x10-19 C. A) Calculate the ejected electron's kinetic energy, in electron Volts (or eV). B) If the photons have a 300 nm wavelength, determine the work function (or binding energy), BE of the metal. C) Calculate the stopping potential Vo, required to stop the ejected electrons from reaching the far electrode. (Remember that KE = eVo in this case). D) What is the longest wavelength of light that could eject an electron in this case?