Standing Wave Visualization

Q.

What does T stand for in physics waves

Q. A stretched string is vibrating according to the equation $y=5\sin \left(\frac{\pi x}{2}\right)\cos 4\pi t$, where $y$ and $x$ are in $\text{cm}$ and $t$ is in $\text{sec}$. The distance between two consecutive nodes on the string is

1. $2\text{cm}$
2. $4\text{cm}$
3. $8\text{cm}$
4. $16\text{cm}$