A TV transmitting antenna is 98 m high and the receiving antenna is at the ground level. If the radius of the earth is 6400 km , the surface area covered by the transmitting antenna is approximately:

Question

A TV transmitting antenna is 98 m high and the receiving antenna is at the ground level. If the radius of the earth is 6400 km , the surface area covered by the transmitting antenna is approximately:, 1240 km 2, 3942 km 2, 4868 km 2, 1549 km 2

MARKS App · Accepted Answer

The given data is H = 98 m R = 6400 km The line of sight formula for an antenna is d = 2 R H ⇒ Area = π d 2 = π × 2 × R × h = 2 × 6400 × 98 × 10 - 3 × π = 3940 km 2

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