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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 17 March 2021, Shift 2, Physics Q1

Question 1 of 90 in this shift, Physics question 1 of 30, Section A.

A carrier signal C(t)=25sin⁡(2.512×1010t)=25\sin(2.512\times10^{10}t) is amplitude modulated by a message signal m(t)=5sin⁡(1.57×108t)=5\sin(1.57\times10^{8}t) and transmitted through an antenna. What will be the bandwidth of the modulated signal ?
  1. (1)5050 MHzOfficial answer
  2. (2)88 GHz
  3. (3)2.012.01 GHz
  4. (4)1987.51987.5 MHz

Official answer

Option 1

NTA final key.

Chapter
Communication Systems
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.