What should be the minimum length of the antenna capable of emitting audio signal of wavelength λ?

  1. λ
  2. λ/2
  3. λ/4
  4. λ/8


To radiate a signal with good efficiency, the antenna height must be comparable to the wavelength of the signal (≈λ). For efficiency, we take the antenna length to be at least one fourth of the wavelength of the signal, i.e. λ/4.

The correct option is C.

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