Given, frequency of wave, f=3GHz=3×109Hz Relative permittivity, εr=2.25 Since, f‌‌=C∕λ ⇒‌‌λ‌‌=‌
C
f
=‌
3×108
3×109
=0.1m ∵λm (wavelength of wave in a medium) =λ∕µ and as we know that, µ=√µrεr As, dielectric is non-magnetic, µr=1 ⇒µ=√2.25=1.5 ⇒λm‌‌=‌