A pipe with length $L$ has one end open and the other end closed. A loudspeaker placed at the open end sends a sound wave into the pipe. Once a stationary wave is established, the open end of the pipe is an antinode. Which wavelength of sound could be used to create a stationary wave?
- A$\frac{2L}{3}$
- B$L$
- C$\frac{4L}{3}$
- D$2L$