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Question 20283
JEE Physics · Hard

Principles of Communication: Propagation MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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PropagationHardQuestion 20283

Question

For LOS transmission from a tower of height 100 m on Earth (R = 6400 km), the coverage area in km² is:
  1. A
    ≈ 400π km²
  2. B
    ≈ 1280π km²
    Correct
  3. C
    ≈ 640π km²
  4. D
    ≈ 128π km²

Correct answer

≈ 1280π km²

Explanation

d = √(2Rh) = √(2 × 6400 × 0.1) = √1280 ≈ 35.8 km. Area = πd² = π × 1280 ≈ 1280π km² ≈ 4021 km². Note: h must be in km → h = 0.1 km.

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