The diagram depicts a string under tension between fixed endpoints $X$ and $Y$. A stationary wave is present on the string. The continuous curve represents the string at one extreme displacement. The dashed curve represents the string at the opposite extreme displacement. The central straight dashed line represents the equilibrium position of the string. Point $S$ on the string lies vertically above point $P$. Point $T$ on the string lies vertically below $Q$. Which statement is correct?
- AA short time later, point $R$ on the string will be displaced.
- BPoints $S$ and $T$ on the string move in opposite directions.
- CThe distance between $P$ and $Q$ is one wavelength.
- DTwo points on the string that are equal distances from point $R$ vibrate in phase.