# The diffraction of radiation can be used to determine the spacing between atoms

Particles and WavesThe diffraction of radiation can be used to determine the spacing between atoms. In practice the wavelength of the radiation used should be restricted to a value which is of the same order of magnitude as the interatomic distances to be determined. Such experiments are commonly performed using X-rays (electromagnetic radiation) however a beam of subatomic particles such as of neutrons or electrons may also be used if their corresponding de Broglie wavelength is of the appropriate magnitude.Calculate the de Broglie wavelength of a neutron (mn = 1.67493×10-27 kg) moving at one eight thousandth of the speed of light (c/8000).(Enter at least 4 significant figures.)Calculate the velocity of an electron (me = 9.10939×10-31 kg) having a de Broglie wavelength of 180.1 pm.Can anyone please explain me in detail what the solution is and what is one eight thousand of speed of light? is it (2.9927×10^8/8000)?

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