MCQ
For constructive interference, the phase difference (in radian) between the two waves should be
- A$0, \frac{\pi}{2}, \pi$
- ✓$0,2 \pi, 4 \pi$,
- C$\pi, 3 \pi, 5 \pi$,
- D$\frac{\pi}{4}, \frac{\pi}{2}, \frac{3 \pi}{4}$
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