Radio Antennas often work best when the diameter of the antenna is equal to the wavelength of the radio wave. Reasonable antennas range from 1 cm to 5 meters in diameter . What frequency range does this cover?

(Hint: c = f × λ)

Answer

Start with λf = c, we know that c is 3 x 10⁸ m/s^. For λ = 1 cm, we get 30 GHz, For λ = 5 m, we get 60 MHz. Thus, the band covered is 60 MHz to 30 GHz.