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JEE Main202118 Mar 2021Evening ShiftPhysicsCommunication SystemActual

A TV transmission tower antenna is at a height of 20 m . Suppose that the receiving antenna is at. (i) ground level (ii) a height of 5 m . The increase in antenna range in case (ii) relative to case (i) is n % . The value of n , to the nearest integer, is.

Correct answer

0

Step-by-step solution

Range = 2 R h Range (i) = 2 R h Range (ii) = 2 R h + 2 R h ' where h = 20   m   &   h ' = 5   m Ans = 2 R h ' 2 R h × 100 % = 5 20 × 100 % = 50 %

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