Question

By what percentage will the transmission range of a TV tower be affected when the height of the tower is increased by 21% ?

• A. 12%
• B. 15%
• C. 14%
• D. 10%

Answer 1

Answer: (D)

10%

Answer 2

New range is given by $\sqrt{2 R(h+0.21 h)}$
$\begin{aligned} & =\sqrt{2 R h \times 1.21} \\\ & =1.1 \sqrt{2 R h} \end{aligned}$
It means new range increases by 10 %.