A stationary wave exists on a stretched string. The diagram shows the string at one moment when the string’s displacement is at its greatest. The wave has frequency $250\,\text{Hz}$. Point $P$ on the string has a vertical displacement of $-1.0\,\text{mm}$. What is the vertical displacement of point $P$ after $5\,\text{ms}$?
- A$-1.0\,\text{mm}$
- Bzero
- C$+0.5\,\text{mm}$
- D$+1.0\,\text{mm}$