The graph illustrates the way a particle’s displacement in a wave changes with time. Which statement is correct?
- AThe wave has a period of $2\,\text{s}$ and could be either transverse or longitudinal.
- BThe wave has a period of $2\,\text{s}$ and must be transverse.
- CThe wave has a period of $4\,\text{s}$ and could be either transverse or longitudinal.
- DThe wave has a period of $4\,\text{s}$ and must be transverse.