The wavelength of a moving electron

An electron speeded up through a voltage $V$ has $p = \sqrt{2m_e eV}$. You will find its de Broglie wavelength for several voltages and the first voltage at which it becomes shorter than the Bohr radius. Then the program draws the result.

The idea. $\lambda = \dfrac{h}{\sqrt{2m_e eV}}$.

Your tasks.

1. In wavelength_pm, return the wavelength in pm.
2. Fill wavelengths with the wavelength for each voltage in voltages.
3. Find first_short, the first voltage in the list whose wavelength is below $52.9\ \text{pm}$.