JEE Main 2023PhysicsCommunication SystemMediumMCQ

JEE Main 2023 — Communication System Question with Solution

JEE Main 2023 (11 Apr Shift 1)

Question

A transmitting antenna is kept on the surface of the earth. The minimum height of receiving antenna required to receive the signal in line of sight at 4 km distance from it is x×10-2 m. The value of x is _____.
(Let, radius of earth R=6400 km)

Choose an option

Show full solutionCorrect option: A
Correct answer
A125

Step-by-step explanation

The formula to calculate the range of the antenna is given by

γ=2Rh   ...1

Substitute the values of the known parameters into equation (1) and solve to obtain the required height of the antenna.

4×103=2×6400000×h⇒16×106=2×64×105×h⇒h=1602×64m=108m=10008×10-2 m=125×10-2 m

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About this question

This is a previous-year question from JEE Main 2023, 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.