MCQ
If two waves having amplitudes $2 A$ and $A$ and same frequency and velocity, propagate in the same direction in the same phase, the resulting amplitude will be
- ✓$3 A$
- B$\sqrt{5} \mathrm{~A}$
- C$\sqrt{2} A$
- D$A$
✓
Answer
Correct option: A.
$3 A$
(a) In the same phase $\phi=0$ so resultant amplitude =$a_1+a_2=2 A+A=3 A$
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