A tungsten cathode with work function 4.5 eV is heated torelease electrons that are then initially at rest outside the cathode. The electrons are accelerated by a potentialdifference to create a beam of electrons with a deBroglie wavelength of 0.038 nm
Calculate momentum of an electron in the beam in kg.m/s
Calculate the kinetic energy of an electron in the beam, injoules
Calculate the accelerating voltage
Suppose that light, instead of heat, is used to release theelectrons from the cathoe. What minimum frequency of light isneeded to accomplish this?