Given
There are known refraction coefficients value for many materials, but for visible spectrum waves. I want to know refraction coefficient for megahertz radio waves, for example at 433 MHz.
According to Wikipedia (related English article), the refraction coefficient $n$ is described by the equation, $$n = 1 + \dfrac{Nq^{2}_e}{2\varepsilon_0m_e(\omega^{2}_0-\omega^2)},$$ where $\omega_0$ is the resonance frequency of the material (a constant), and plain $\omega$ is frequency of the wave.
I assume that $N$ equals about $10^{24}$, and $\omega_0$, as stated on Wikipedia page I mentioned, for most materials is in ultraviolet specter $\approx 10^{15}$Hz.
The $n(\omega)$ dependency is
Problems
- Do I understand correctly, that the lower frequency, the lower refraction coefficient (i.e., wave takes less time to travel through material)?
- Is there table with actual values of refraction for megahertz waves, for materials, such as concrete, glass, etc.?
Possible answers:
