Question

Let the radius of earth be devoted by R. The graph’s, representing, the co–relation between the height (H) of a transmitting antenna and its radio horizon (d_m), is/are the graph/s labelled as graphs.

(1) (A) and (B)

(2) (B) and (C)

(3) (C) and (A)

(4) (C) and (D)

Answer 1

(3) (C) and (A)

The radio horizon, d_m , of a transmitting antenna, in related to its height (H), through the relation.

Hence a graph, between d_m and √H , as well as that between d_m² and H, would be a straight line, passing through the origin and having a slope 2R. It is graphs (A) and (C), that meet all these requirements.