The length of antenna for trans mitting

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Target Exam

CUET

Subject

Physics

Chapter

Communication

Question:

The length of antenna for trans mitting a signal of 30 kHz is:

Options:

$l=km$

$l=500\, m$

$l=2.5 km $

$l=10\, km$

Correct Answer:

$l=2.5 km $

Explanation:

The correct answer is option (3) : $l=2.5 km $

$l_{min}=\frac{\lambda }{4f}=\frac{c}{4f}=\frac{3\times 10^8}{4\times 3 \times 10^4}$

$= 2500\, m$

$= 2.5 \, km$