$A$ sound wave of frequency $200 Hz$ is travelling in air. The speed of sound in the air is $340 m s^{-1}$. What is the phase difference at a given instant between two points separated by a distance of $85 cm$ along the direction of propagation?
- A$\pi$
- B$2 \pi$
- C$\frac{\pi}{2}$
- D$\frac{\pi}{4}$
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