Size of the antenna for a carrier wave of frequency 3 MHz is

Size of the antenna for a carrier wave of frequency 3 MHz is
  1. 75 m
  2. 50 m
  3. 2.5 m
  4. 25 m

Solution

$\mathrm{f}_{\mathrm{c}}=3 \mathrm{MH}_{\mathrm{z}}=3 \times 10^6 \mathrm{H}_{\mathrm{z}}$ $\therefore$ Wavelength, $\lambda=\frac{\mathrm{c}}{\mathrm{f}}=\frac{3 \times 10^8}{3 \times 10^6}=100 \mathrm{~m}$ $\therefore$ Size of the antenna, $1=\frac{\lambda}{4}=\frac{100}{4}=25 \mathrm{~m}$

Asked in: AP EAMCET 2024 (23 May Shift 1)

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