# Find wavelength from relative permittivity and frequency

If i have a EM wave with frequency 1MHZ and εr=9 in a perfect dielectric ,is it possible to find the wavelength λ and wave propagation speed ? It seems impossible to me..

-

(1) $\lambda \nu = c$
(2) $c^2 = \frac{1}{\mu_0 \epsilon_r \epsilon_0}$