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NTA Abhyas 2020

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

NTA Abhyas 2020 · Physics · Communication System

The radius of the Earth is 6400 km. If the height of an antenna is...

The radius of the Earth is

6400

km. If the height of an antenna is

500m

, then its range is

Options

A $800$ km
&
B $100$ km
C $80$ km
D $10$ km

Correct answer

C. $80$ km

Step-by-step solution

Given,

R = 6400km = 6.4 \times {10}^{6}m, h = 500m

∴ Range, d = \sqrt{2hR}

= \sqrt{2 \times 500 \times 6.4 \times {10}^{6}}

= \sqrt{64 \times {10}^{8}} = 8 \times {10}^{4} = 80km

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