JEE Main 2019PhysicsCommunication SystemEasyMCQ

JEE Main 2019 — Communication System Question with Solution

JEE Main 2019 (10 Jan Shift 1)

Question

A TV transmission tower has a height of 140 m and the height of the receiving antenna is 40 m. What is the maximum distance upto which signals can be broadcasted from this tower in LOS (Line of Sight) mode? (Given: radius of earth =6.4×106 m).

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Show full solutionCorrect option: D
Correct answer
D65 km

Step-by-step explanation

D=2hTR+2hRR

D=2×140×64×105+2×40×64×105

D=8×103[28+8]

D=8× 10 3 [ 2 7 +2 2 ]

D=16× 10 3 [ 7+ 2 ]

D=16×1032.6+1.4

=64000m=64km≃65km

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About this question

This is a previous-year question from JEE Main 2019, covering the Communication System chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.