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Friday, 9 October

JEE Main 2026 · PhysicsMultiple choiceSingle correctEasyConceptual

JEE Main 6 April 2026, Shift 1, Physics Q40

Question 40 of 75 in this shift, Physics question 15 of 25, Section A.

A point light source emits E.M. waves in free space. A detector, placed at a distance of LL m, measures the intensity as I0I_0. The detector is now shifted to another location on the same spherical surface ensuring the angle between original location and new location as 45°45°. The measured intensity at new location will be ________.
  1. (1)I04\frac{I_0}{4}
  2. (2)I0I_0Official answer
  3. (3)I02\frac{I_0}{\sqrt{2}}
  4. (4)I02\frac{I_0}{2}

Official answer

Option 2

NTA final key.

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