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\( P, Q \) and \( R \) are three particles of a medium which lie on the \( x \)-axis. A sine wave of wavelength \( \lambda \) is travelling through the \( \mathrm{P} \) medium in the \( x \)-direction. \( P \) and \( Q \) always have the same speed, while \( P \) and \( R \) always have the same velocity. The minimum W distance between :
(A) \( P \) and \( Q \) is \( \lambda / 2 \)
(B) \( P \) and \( Q \) is \( \lambda \)
(C) \( P \) and \( R \) is \( \lambda / 2 \)
(D) \( P \) and \( R \) is \( \lambda \)
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