The length of antenna for trans mitting a signal of 30 kHz is:
Answer & explanation
Correct answer: option 3
The correct answer is option (3) : $l=2.5 km $
$l_{min}=\frac{\lambda }{4f}=\frac{c}{4f}=\frac{3\times 10^8}{4\times 3 \times 10^4}$
$= 2500\, m$
$= 2.5 \, km$