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NTA Abhyas JEE Main2020PhysicsCommunication SystemPractice

Calculate how much population would be covered by T.V. broadcast if height of TV tower is 100 m and the average population density around the tower is 1000 km - 2 (Take radius of earth as R = 6.4 × 10 6 m )

Options

  1. A6 × 10 6
  2. B2 × 10 6
  3. C12 × 10 6
  4. D4 × 10 6

Correct answer

D. 4 × 10 6

Step-by-step solution

Radius of range covered by tower, d = 2 hR Population covered = ρ × π d 2 = ρ × π ( 2 hR ) = 4 × 10 6

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