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Friday, 9 October

JEE Main 2025 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 7 April 2025, Shift 1, Physics Q34

Question 34 of 75 in this shift, Physics question 9 of 25, Section A.

Two harmonic waves moving in the same direction superimpose to form a wave x=acos⁡(1.5t)cos⁡(50.5t)x = a\cos(1.5t)\cos(50.5t) where t is in seconds. Find the period with which they beat. (close to nearest integer)
  1. (1)22 sOfficial answer
  2. (2)44 s
  3. (3)66 s
  4. (4)11 s

Official answer

Option 1

NTA final key.

Chapter
Waves
Topic
Beats
Idea tested
Resultant Wave Equation in Beats

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 42 of the 174 JEE Main shifts held from 2017 to 2026.