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NEET2011PhysicsCommunication SystemActual

The area covered by a transmitting antenna of height 50 ~m is

Options

  1. A320 km ^2
  2. B1440 ~km ^2
  3. C640 km ^2
  4. D120 km ^2

Correct answer

C. 640 km ^2

Step-by-step solution

Here, h=50 ~m Area covered = d^2= 2 h R ( d^2=2 h R ) where R=6.4 10^6 ~m (radius of earth) aligned area covered & = 2 h R= 2 50 6.4 10^6 & =640 10^6 ~m ^2=640 km ^2 aligned

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