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JEE Main 202313 AprilEvening Shift

Exam: JEE Main
Year: 2023
Date: 13 April
Shift: Evening Shift
Subject: Physics
Chapter: Communication System

JEE Main 2023 · 13 April · Evening Shift · Physics · Communication System

To radiate EM signal of wavelength λ with high efficiency, the...

To radiate EM signal of wavelength

\lambda

with high efficiency, the antennas should have a minimum size equal to:

Options

A $2\lambda$
B $\dfrac{\lambda}{2}$
C $\dfrac{\lambda}{4}$
D $\lambda$

Correct answer

C. $\dfrac{\lambda}{4}$

Step-by-step solution

For efficient radiation and reception, the height of transmitting and receiving antennas should be comparable to a quarter of wavelength of the frequency used. So for efficient transmission of signals of wavelengths $\lambda$ the minimum length of antenna should be $\dfrac{\lambda}{4}$ .

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