Question bank/JEE Main/Physics

Three harmonic waves having equal frequency v and same intensity
$I_{0}$, have phase angles 0, $\frac{\pi}{4}$ and$- \frac{\pi}{4}$
respectively. When they are superimposed the intensity of the resultant
wave is close to

A$5.8\ I_{0}$B${3\ I}_{0}$C$I_{0}$D$0.2\ I_{0}$

Show answer and solution▾

$I_{res} = (\sqrt{2} + 1)^{2}I_{0}$
$= (3 + 2\sqrt{2})I_{0} = 5.8I_{0}$

Source: Grass-G / P-19 Physics paper 28 Nov Fourth.docx