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July 31, 2014

Homework Help: physics

Posted by shelly on Monday, June 9, 2008 at 10:06pm.

in an electron microscope, a tungstun cathode with work function 4.5 eV is heated to release electrons that are then initially at rest just outside the cathode. The electrons are accelerated by a potential difference to create a beam of electrons with a de Broglie wavelength of 0.038 nm. Assume nonrelativistic apply to the motion of the electrons. calculate the momentum of an electron in the beam, in kg x m/s. calcualte the kinetic energy of an electron in the beam, in joules. calculate the accelerating voltage. suppose the light, instead of heat, is used to release the electrons from the cathode. What minimum frequency of light is needed to accomplish this?

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