Potential difference of helium nucleus question

[ooohffff]

Homework Statement

What potential difference is needed to give a helium nucleus (Q = 3.2 × 10-19 C) 50 keV of kinetic energy?

Homework Equations

V=U/Q
3.2 × 10-19 C = 2e

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

 

[TSny]

Your work looks correct assuming that they just want the magnitude of the potential difference. If they want the potential difference as ΔV = V_final - V_initial, then you should consider the sign of the potential difference.

 

[ooohffff]

Your work looks correct assuming that they just want the magnitude of the potential difference. If they want the potential difference as ΔV = V_final - V_initial, then you should consider the sign of the potential difference.

Ah, yes, you're right. Thanks!