Discussion
If a carrier wave of 1000 kHz is used to carry the signal, the length of transmitting antenna will be equal to _____ ?
Answer: A
The answer is 300 m.
The wavelength of the carrier is \[\lambda = \frac{c}{f} = \frac{3\times10^{8}}{1000\times10^{3}} = 300\ \mathrm{m}\] An antenna must be comparable to the wavelength to radiate efficiently, which is why long-wave broadcasting needs very tall masts. In practice a quarter-wave antenna of 75 m is often used.
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