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Superposition, Interference and Intensity for JEE: 9 solved questions

Real JEE paper questions on superposition, interference and intensity, part of waves. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 2007 to 2026. No sign-in needed to read them.

What this topic asks

• Interference of two waves — 5 questions
• Sound intensity and decibels — 4 questions

All 9 questions with solutions

• The amplitude and phase of the wave formed by superposing the two harmonic travelling waves y₁(x,t)=4 sin(kx-… JEE Main 8th April 2nd Shift 2025
• Three harmonic waves of equal frequency u and equal intensity I₀ have phase angles 0, π/4 and -π/4. When they… JEE Main 9th Jan 1st Shift 2020
• A small speaker delivers 2 W of audio output. The distance from the speaker at which one detects a 120 dB sou… JEE Main 12th April 2nd Shift 2019
• Statement-I: The two longitudinal waves y₁(x,t)=2a sin(ω t-kx) and y₂(x,t)=a sin(2ω t-2kx) have equal intensi… JEE Main Re-Scheduled 2011
• A sound absorber attenuates the sound level by 20 dB. The intensity decreases by a factor of JEE Main 2007
• [Figure: two loudspeakers L₁ and L₂ standing 10 m apart; a recorder starts at the point A on the perpendicula… JEE Main 22nd Jan 1st Shift 2026
• A point source at the origin emits sound of intensity 16×10⁻⁸ W m⁻² at unit distance. The difference in inten… JEE Main 30th Jan 2nd Shift 2024
• Two interfering waves are y₁=10 sin (ω t+π/3) cm and y₂=5[sin ω t+√3 cos ω t] cm. The amplitude of the result… JEE Main 31st Jan 2nd Shift 2023
• Two waves pass simultaneously through a string: y₁=A₁ sin k(x-vt) and y₂=A₂ sin k(x-vt+x₀), with A₁=12 mm, A₂… JEE Main 26th Aug 2nd Shift 2021