Q. If two waves having amplitudes $2A$ and $A$ and same frequency and velocity, propagate in the same direction in the same phase, the resulting amplitude will be
A) $3A$
B) $\sqrt{5}A$
C) $\sqrt{2}A$
D) $A$
Explanation
(a) In the same phase $\phi = 0$ so resultant amplitude $= a_{1} + a_{2} = 2A + A = 3A$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.