An electromagnetic wave of frequency 5 GHz, is travelling in a medium whose relative electric permittivity and relative magnetic permeability both are 2. Its velocity in this medium is ________× 10^{7}m/s.

The correct answer is 15

\(n=\sqrt{\mu_r ε_r}=2\)

\(v={c\over n}\) =\(3×10^8\over 2\)

=15×10^{7 }m/s

Hence X=15 the answer