Question

If height of a transmitting tower increases by $21$%, then the area to be covered increases by

• A. $10$%
• B. $21$%
• C. $42$%
• D. $84$%

Answer 1

The correct option is B $21$%

$d_{max}=\sqrt{2R{H}_T}\Rightarrow H_T\propto d_{max}^2\propto A$
Thus, if the height of the tower is increased by $h$%, then the area covered is increased by $h$%.