An electromagnetic wave of frequency 3 GHz enters a dielectric medium of relative electric permittivity 2 . 25 from vacuum. The wavelength of this wave in that medium will be _________ × 10 - 2 cm .

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λ in vacuum = c f = 3 × 10 8 3 × 10 9 = 0 . 1 m ∴ λ in medium = 0 . 1 μ Where refractive index μ = μ r ε r Assuming non-magnetic material μ r = 1 ∴ μ = 2 . 25 = 1 . 5 λ m = 0 . 1 1 . 5 = 1 15 m = 6 . 67 cm = 667 × 10 - 2 cm

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