An organ creates notes by forcing air into a set of pipes, each of which is open at one end and closed at the other. The speed of sound in the air inside the pipes is $320\,\text{m s}^{-1}$. What is the lowest frequency of sound produced by a pipe of length $10\,\text{m}$?
- A$4\,\text{Hz}$
- B$8\,\text{Hz}$
- C$16\,\text{Hz}$
- D$32\,\text{Hz}$