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P,Q and R are three particle of a medium...

P,Q and R are three particle of a medium which lie on the x-axis. A sin wave of wavelength `lamda` is travelling through the medium in the x-direction. P and Q always have the same speed. Whilem P and R always have the same velocity. The minimum distance between :-

A

P and Q is `(lamda)/(2)`

B

P and Q is `lamda`

C

P and R is `(lamda)/(2)`

D

P and R is `lamda`

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The correct Answer is:
A, D
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