Cross-section and types of scattering

https://en.wikipedia.org/wiki/Cross_section_(physics)

dimensionality $\sigma \sim (cm)^2$

• Point scatterers for classical waves 1998

resonant scattering at high frequencies $\sigma \sim \frac{1}{\omega^2}$

Rayleigh scattering https://en.wikipedia.org/wiki/Rayleigh_scattering

$\sigma \sim \frac{1}{\omega^4}$

• https://en.wikipedia.org/wiki/Brillouin_scattering#Contrast_with_Rayleigh_scattering

https://en.wikipedia.org/wiki/Raman_scattering