The de Broglie's wavelength of neutron is 3.96×10−27J
The De Broglie Wavelength gives the wavelength of any particle traveling with linear momentum. It shows an inverse relationship between the linear momentum and wavelength distance (IE a particle with high momentum has a short wavelength). This also works to explain the macroscopic scale in that a macroscopic body has such a high momentum that the wavelength is so small it is undetectable and in turn explains why the wave-like properties cannot be observed.
l=h/p
h= Planck’s constant
p= linear momentum
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