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**1. The problem statement, all variables and given/known data**

Through what potential difference should you accelerate an electron from rest, such that it's de Broglie wavelength will be 0.1 nm.

**2. Relevant equations**

E = hf

λf = c

**3. The attempt at a solution**

My Thinking was;

E = hf

E = hλ/c

E= 6.626e-34 * 1e-10/3e8

which turned out 2.21e-58 J, which I'm pretty sure is wrong.

Anyone with some ideas or a worked solution would be fantastic :D

Regards all,

Will.