A stationary wave is produced by two identical sound waves. A microphone is placed where the loudness is at a maximum. It is then shifted along the stationary wave from this first maximum-loudness position to the fourth maximum-loudness position. The microphone travels a distance of $12\,\text{cm}$. The speed of sound is $330\,\text{m s}^{-1}$. What is the frequency of the sound waves?
- A$4100\,\text{Hz}$
- B$5500\,\text{Hz}$
- C$8300\,\text{Hz}$
- D$11\,000\,\text{Hz}$