A wave with frequency $15\,\text{Hz}$ moves through a medium at $24\,\text{m s}^{-1}$. What is the phase difference between two points $2\,\text{m}$ apart?
- AThere is no phase difference.
- BThey are out of phase by a quarter of a cycle.
- CThey are out of phase by half a cycle.
- DThey are out of phase by $0.8$ of a cycle.