A parallel light beam at a wavelength of 200 m is incident normally on the surface of a metal of which the work function is 3.44 eV.

a. ???Determine the shortest de Broglie wavelength of the electrons photoelectrically ejected from the surface. (answer: 7.382x10^-10m)

b.??? If the intensity of the light beam is 0.95 W/m?, determine the number of electrons ejected from a square centimeter of the metal surface each second. Assume that the probability of each photon being absorbed by an electron is 0.3.(answer: 2.869x10¹³/cm²s)

c. Determine the potential that can stop the electrons from being ejected from the metal surface.(answer: 2.76V)

1. A parallel light beam at a wavelength of 200 nm is incident normally on the surface of a metal of which the work function is 3.44 eV. a) Determine the shortest de Broglie wavelength of the electrons photoelectrically ejected from the surface. b) If the intensity of the light beam is 0.95 W/m, determine the number of electrons ejected from a square centimeter of the metal surface each second. Assume that the probability of each photon being absorbed by a electron is 0.3. c) Determine the potential that can stop the electrons from being ejected from the metal surface