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In communication with help of antenna if height is doubled then the range

In communication with help of antenna if height is doubled then the range covered which was initially r would become

Options

(a) √2r
(b) 3r
(c) 4r
(d) 5r

Correct Answer:

√2r

Explanation:

Range r = √(2Rh)

Where R is the radius of the earth and h is the height of the antenna

.·. r’ = √[2R(2h)] = √2 [√(2Rh)] = √2 r

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