A stationary wave is formed when two loudspeakers emit sound with the same frequency. As a microphone is moved from X to Y over a distance of $1.5\,\text{m}$, six nodes and seven antinodes are observed. What is the wavelength of the sound?
- A$0.50\,\text{m}$
- B$0.43\,\text{m}$
- C$0.25\,\text{m}$
- D$0.21\,\text{m}$