Propagation of electromagnetic waves

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Question

An audio signal is sent on a carrier wave of frequency 30MHz. The minimum length of the antenna at the transmitting station must be _______ (in m).

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Solution

$λ = \frac{3 \times 10^{8}}{30 \times 10^{6}} m = 10 m$
Minimum length of transmitting antenna must be $\frac{λ}{4} = \frac{10}{4} = 2.5 m$

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