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NTA Abhyas 2020

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

NTA Abhyas 2020 · Physics · Communication System

If the height of TV tower is increased by 21% , then the...

If the height of TV tower is increased by

21%

, then the transmission range is enhanced by

Options

A $10%$
B $5%$
C $15%$
D $25%$

Correct answer

A. $10%$

Step-by-step solution

Range

= \sqrt{2Rh} ⇒

Range

∝ \sqrt{h}

Here

h

increases to

1.21h

∴

Enhancement range

∝ {\left(1.21\right)}^{\dfrac{1}{2}} = 1.1

∴

Increase

= 1.1 - 1 = 0.10

∴ %

increase

= 0.10 \times 100 = 10%

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