A loudspeaker set above a tube makes the air inside the tube resonate. A stationary wave is produced with two nodes and two antinodes, as shown. The height of the tube is $60\ \text{cm}$. The speed of sound in air is $340\ \text{m s}^{-1}$. What frequency does the sound have?
- A$430\ \text{Hz}$
- B$570\ \text{Hz}$
- C$850\ \text{Hz}$
- D$1700\ \text{Hz}$