De Broglie Wavelength of Accelerated Proton

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Homework Statement


A proton is accelerated from rest through a potential of 1kV. Find its de Broglie wavelength.

Homework Equations


\lambda=h/p

The Attempt at a Solution


I tried to get p (momentum) by energy comparison:

e*1000=0.5*m*v^2
v=437 621.130 016 524 m/s

which doesn't makes sense... what am I doing wrong?
 
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Do you mean 437621.130016524 m/s? Or 437,621,130,016,524 m/s? If the first, then that is roughly what I get when using google calculator (but why so many places after the decimal??), why doesn't it make sense to you? If the second, then that indeed doesn't make sense ,and I would recommend trying to put in the numbers again.
 
Oh snap!
It didn't make sense since I used Planck constant with eV*s units all the time instead of J*s units...

Thanks nicksauce.
 

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