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Potential difference of helium nucleus question

  1. Sep 25, 2016 #1
    1. The problem statement, all variables and given/known data
    What potential difference is needed to give a helium nucleus (Q = 3.2 × 10-19 C) 50 keV of kinetic energy?

    2. Relevant equations
    3.2 × 10-19 C = 2e

    3. The attempt at a solution
    I was quite sure I had the right answer but it keeps saying I'm wrong?

    V = (50*10^3 eV) / 2e = 25,000 V
  2. jcsd
  3. Sep 25, 2016 #2


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    Homework Helper
    Gold Member

    Your work looks correct assuming that they just want the magnitude of the potential difference. If they want the potential difference as ΔV = Vfinal - Vinitial, then you should consider the sign of the potential difference.
  4. Sep 25, 2016 #3
    Ah, yes, you're right. Thanks!
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