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JEE Main 202117 MarchMorning Shift

Exam: JEE Main
Year: 2021
Date: 17 March
Shift: Morning Shift
Subject: Physics
Chapter: Communication System

JEE Main 2021 · 17 March · Morning Shift · Physics · Communication System

For VHF signal broadcasting, _______ km ^ 2 of maximum service area...

For VHF signal broadcasting, _______

{km}^{2}

of maximum service area will be covered by an antenna tower of height

30m,

if the receiving antenna is placed at ground. Let radius of the earth be

6400km .

(Round off to the Nearest Integer) (Take

\pi

as

3 . 14

)

Correct answer

0

Step-by-step solution

$d = \sqrt{2Rh}$

$A = \pi{d}^{2}$

$A = \pi2Rh$

$= 3 . 14 \times 2 \times 6400 \times \dfrac{30}{1000}$

$A = 1205 . 76{km}^{2}$

$A ≃ 1206{km}^{2}$

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