Two simple harmonic progressive waves have displacements $\rightarrow \mathrm{y}_1=\mathrm{a}_1 \sin \left(\frac{2 \pi \mathrm{x}}{\lambda}-\omega \mathrm{t}\right)$ and $\mathrm{y}_2=\mathrm{a}_2 \cos \left(\frac{2 \pi \mathrm{x}}{\lambda}-\omega \mathrm{t}+\phi\right)$ What is the phase difference between two waves?
- A$\left(\phi+\frac{\pi}{2}\right)$
- B$\phi$
- C$\left(\phi-\frac{\pi}{2}\right)$
- D$(\phi+\pi)$
✓ Correct answer: A
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