A beam of high energy neutrons is scattered from a metal lattice, where the space between the nuclei is around 0.4nm. To see the quantum diffraction effect, the kinetic energy of electron must be around ??
To see that neutron is a particle with de Broglie wavelength, one needs to see the interference of diffracted waves.
To see the interference at least in the lowest order (),
So the kinetic energy of neutron is
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