A corridor is $13.2\,\text{m}$ in length and has closed doors at both ends that reflect sound. The speed of sound in the air inside the corridor is $330\,\text{m s}^{-1}$. What is the lowest frequency of sound that could produce a stationary wave in the corridor with a node at the midpoint?
- A$0.040\,\text{Hz}$
- B$13\,\text{Hz}$
- C$25\,\text{Hz}$
- D$50\,\text{Hz}$