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Homework Help: Converting volts into energy

  1. Aug 8, 2012 #1
    1. The problem statement, all variables and given/known data
    What possibility can be the ratio of the de Broglie wavelengths for electrons accelerated through 50 volts and 200 volts, initially having same wavelengths?

    2. Relevant equations
    I have literally no idea how to convert volts into energy, here i somewhat i think,
    Energy= Charge of electron * given volt.
    if the above equation is correct then should i add the calculated energy to initial energy,
    that will be initial energy+ calculated energy, the same way for both the potential differences given?

    3. The attempt at a solution
  2. jcsd
  3. Aug 9, 2012 #2

    Simon Bridge

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    Science Advisor
    Homework Helper

    1eV is the energy gained by one electron accelerated through a potential of 1V ... do everything in eV.
    You only need the ratios ... so write out the formula for the debroglie wavelengths for each case and divide them out.
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