A neutron of mass is moving with a speed of

PHYSICS · Multi-part · A Level · Physics · Particles and radiation · Particles and radiation

Problem

A neutron of mass

1.675\times10^{-27}\,\text{kg}

is moving with a speed of

2.2\times10^{3}\,\text{m s}^{-1}

. (Take

h = 6.626\times10^{-34}\,\text{J s}

.) (i) Calculate its de Broglie wavelength. (ii) The typical interatomic spacing in a crystal is

0.30\,\text{nm}

. State whether the neutron beam is likely to show diffraction by such a crystal.