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JEE Main 31 January 2024, Shift 1, Physics Q59

Question 59 of 90 in this shift, Physics question 29 of 30, Section B.

Two waves of intensity ratio 1:9 cross each other at a point. The resultant intensities at that point, when (a) Waves are incoherent is

I_1

(b) Waves are coherent is

I_2

and differ in phase by

60^\circ

. If

\frac{I_1}{I_2}=\frac{10}{x}

then

x=

_______.

Official answer

NTA final key.

Chapter: Wave Optics
Topic: Young's Double Slit
Idea tested: Resultant Intensity Formula

Same idea in other shifts

Asked 5× in all

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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.