What will be the minimum length of antenna required to transmit a radio signal of frequency 10 MHz?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 7.5 m
The wavelength (λ) of a radio wave is -
$λ=\frac{c}{v}$
v = frequency = $10×10^6Hz$
$∴λ=\frac{3×10^8}{10×10^6}=30m$
$L_{min}=\frac{λ}{4}=\frac{30}{4}=7.5m$