JEE Main 2021PhysicsCommunication SystemMediumMCQ

JEE Main 2021 — Communication System Question with Solution

JEE Main 2021 (22 Jul Shift 1)

Question

What should be the height of transmitting antenna and the population covered if the television telecast is to cover a radius of 150 km?  The average population density around the tower is 2000 km-2 and the value of Re=6.5×106 m.

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Show full solutionCorrect option: A
Correct answer
AHeight =1731 m
Population Covered =1413×105

Step-by-step explanation

Radius covered, r=2RHT
150 km=2×6.5×106 mHT
150 km×1032=2×6.5×106HT
HT=1731 m

Population covered =πr22000 km-2
=3.14×(150)2×2000=1413×105

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About this question

This is a previous-year question from JEE Main 2021, 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.