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Electron accelerated through field

  1. Sep 20, 2006 #1
    A beam of electrons is accelerated through a field of a different potential which produces a velocity of 5,45x10^7 m/s. The mass of an electron being 9,11x10^(-31) kg, what would be the wave length of the electron beam?

    A question i encountered when doing homework, i need some help with this one..anyone? thanks:redface:
  2. jcsd
  3. Sep 20, 2006 #2


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    So you need some relation between the mass, velocity and wavelength of your electrons. Did you learn about anything that relates these?
  4. Sep 20, 2006 #3
    would it be...
    (5.45x10^7)(3x10^8)^2=(6.626x10^-34)(f)....find the frequency and therefore the wave length?...id like to know wether i should be finding the electron's rest energy, kinetic energy..or should i use (mc^2)/(1-v^2/c^2)^1/2?..(lorentz transformation of energy)
  5. Sep 20, 2006 #4
    i got 0,0013 nanometers
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