## Neutron and Electron Wavelength

$\lambda=\frac{h}{p}$

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### Neutron and Electron Wavelength

How do you determine whether a neutron or an electron has the shorter wavelength?

K Honeychurch 1K
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Joined: Fri Sep 26, 2014 2:02 pm

### Re: Neutron and Electron Wavelength

You use the de Broglie wavelength equation wavelength=h/p=h/(mv), however you need to know the velocities of the electron and neutron.
If you are referring to the question3B on the midterm, it is given that the neutron and electron have the same speed. So, since a neutron has a greater mass its wavelength will be shorter (notice that wavelength is inversely proportional to momentum (p) which is mass x velocity).