Answer to Question #145986 in Electricity and Magnetism for Besmallah Yousefi

Question

Electron Diffraction: Describe the diffraction of electrons by a crystalline material. What is the wavelength of an electron? How is the wavelength of the electron controlled? How is crystal lattice spacing determined? You may use equations, sample calculations as examples and diagrams to enhance your description.

Answer 1

When electron and the crystalline materials interact to each other then it produce rings or spots which is characterize as the sample. The wavelength of the electron can be represented by $\lambda = \frac{h}{p}=\frac{h}{mv}$

Wavelength of he electron can be controlled by controlling the speed of the electron.

Crystalline lattice is the array of atoms, which is called unit cells, which is repeated over and over again. Since the vertices of the unit cell are atoms, the size of the unit cell is related to the inter-atomic spacing, or lattice constant which is represented as a.