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JEE Main 2021 · PhysicsNumerical answerNumerical valueEasyCalculation

JEE Main 4 August 2021, Shift 2, Physics Q21

Question 21 of 90 in this shift, Physics question 21 of 30, Section B.

An Amplitude Modulated (AM) wave is expressed as

C=5(1+0.3\cos200\pi t)\cos(1\times10^8\,\pi t)

volts. Its percentage modulation is _________%.

Official answer

30

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.