Q29 / 32 · NTA Abhyas (JEE Main) 2020 · Physics · Communication System

If the area to be covered for TV telecast is doubled, then the height of transmitting antenna (TV tower) will have to be

Correct answer
A
Doubled
B
Halved
C
Quadrupled
D
16 times

Solution

We know that

d = \sqrt{2 h R_{e}}

A = π d^{2} = 2 π h R_{e}

area proportional to the height of the antenna

\Rightarrow A \propto h

Hence, the correct answer is option: 'A'.

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