Q. In a stationary wave represented by y=2a cos kx sin $\omega$t the intensity at a certain point is maximum when
A) cos kx is maximum
B) cos kx is minimum
C) Sin $\omega$t is maximum
D) sin $\omega$t is minimum
Explanation
(a) $Intensity\ \propto (amplitude)^{2}$
$\propto \left( 2a\cos{kx} \right)^{2}$
Hence, intensity will be maximum when cos kx is maximum.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.