Sound produced by a loudspeaker positioned above a tube makes the air in the tube resonate. A stationary wave is produced with two nodes and two antinodes, as shown. The speed of sound in air is $340\,\text{m s}^{-1}$. What is the frequency of the sound?
- A$430\,\text{Hz}$
- B$570\,\text{Hz}$
- C$850\,\text{Hz}$
- D$1700\,\text{Hz}$