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NTA Abhyas 2020

Exam: NTA Abhyas
Year: 2020
Subject: Physics
Chapter: Communication System

NTA Abhyas 2020 · Physics · Communication System

Minimum length of antenna required to transmit a radio signal of...

Minimum length of antenna required to transmit a radio signal of frequency

10MHz

is equal to

Options

A $\text{8.5}m$
B $\text{6}m$
C $\text{4}m$
D $\text{7.5}m$

Correct answer

D. $\text{7.5}m$

Step-by-step solution

${L}_\min = \dfrac{λ}{4}$

$\lambda = \dfrac{c}{v}$

$= \dfrac{3 \times {10}^{8}}{107} = 30\text{m}$

${L}_\min = 7. 5m$

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