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JEE Main202126 Aug 2021Evening ShiftPhysicsCommunication SystemActual

A transmitting antenna at top of a tower has a height of 50 m , and the height of receiving antenna is, 80 m . What is the range of communication for the line of sight (LOS) mode? [use radius of the earth = 6400 km ]

Options

  1. A80 . 2   km
  2. B144 . 1   km
  3. C57 . 28   km
  4. D45 . 5   km

Correct answer

C. 57 . 28   km

Step-by-step solution

The formula of range of the antenna is given by the formula, = 2 R h 1 + 2 R h 2 ., here R is the radius of the earth then, putting the values, the range = 57 . 28   km .

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