## Episode 529: Preparation for X-ray and neutron diffraction topic

Teaching Guidance for 16-19

- Level Advanced

This topic could extend a study of diffraction of waves, or be part of a study of material structures, or of atomic physics.

#### Main aims of this topic

Students will:

- relate diffraction effects to the spacing of gratings etc and to the wavelength of the radiation involved
- state some uses of X-ray and neutron diffraction
- apply Bragg’s law

#### Prior knowledge

Students should be familiar with diffraction due to a standard (transmission) grating
*d*sin( θ ) = n × *λ*
,
de Broglie’s formula
*λ* = *h**p*.
It will also help if they are aware that, at (absolute) temperature *T*, typical energy ~ *k**T*.

#### Where this leads

This topic could lead into a study of the structures and properties of solid materials.