The diagram illustrates an experiment used to form a stationary wave in an air column. A tuning fork positioned above the column vibrates and generates a sound wave. The length of the air column may be changed by adjusting the amount of water in the tube. The tube is filled and then the water is allowed to drain out. The first two stationary waves are produced when the air column lengths are $0.14\,\text{m}$ and $0.42\,\text{m}$. What is the wavelength of the sound wave?
- A$0.14\,\text{m}$
- B$0.28\,\text{m}$
- C$0.42\,\text{m}$
- D$0.56\,\text{m}$