If two waves having amplitudes $2A$ and $A$ and same frequencies and velocities, propagate in the same…
If two waves having amplitudes $2A$ and $A$ and same frequencies and velocities, propagate in the same direction in the same phase, the resulting amplitude will be
$3A$
$\sqrt{5}A$
$\sqrt{2}A$
$A$
Solution
In the same phase, $\phi = 0$. So, resultant amplitude
$= a_1 + a_2 = 2A + A = 3A$