MCQ
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
- ✓$3A$
- B$\sqrt 5 A$
- C$\sqrt 2 A$
- D$A$
✓
Answer
Correct option: A.
$3A$
a
(a) In the same phase $\phi = 0$
(a) In the same phase $\phi = 0$
so resultant amplitude = ${a_1} + {a_2} = 2A + A = 3A$
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