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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceSingle correctEasyConceptual

JEE Main 25 February 2021, Shift 2, Physics Q17

Question 17 of 90 in this shift, Physics question 17 of 30, Section A.

If a message signal of frequency ‘fmf_m’ is amplitude modulated with a carrier signal of frequency ‘fcf_c’ and radiated through an antenna, the wavelength of the corresponding signal in air is :
  1. (1)cfc−fm\frac{c}{f_c - f_m}
  2. (2)cfc+fm\frac{c}{f_c + f_m}
  3. (3)cfc\frac{c}{f_c}Official answer
  4. (4)cfm\frac{c}{f_m}

Official answer

Option 3

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.