JEE Main 2019PhysicsCommunication SystemEasyMCQ

JEE Main 2019 — Communication System Question with Solution

JEE Main 2019 (08 Apr Shift 2)

Question

In a line of sight radio communication, a distance of about 50 km is kept between the transmitting and receiving antennas. If the height of the receiving antenna is 70 m, then the minimum height of the transmitting antenna should be: (Radius of the Earth =6.4×106 m)

Choose an option

Show full solutionCorrect option: D
Correct answer
D32 m

Step-by-step explanation

Range, d=2 RhT+2 Rhr
⇒50=2×6400×hT+2×6400×70×10-3
⇒2×6400×hT=50-814
hT=50-81422×6400=0.031458 km
hT≈32 m

Practice this on the real CBT interface

Solve this JEE Main question (and the rest of the Communication System chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.

Solve interactively →

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.