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P, Q and R are three particles of a medi...

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 medium in the x-direction. P and Q always have the same speed, while P and R always have the same velocity.
The minimum distance between –
(1) P and Q is `lambda`
(2) P and Q is `lambda//2`
(3) P and R is `lambda//2`
(4) P and R is `lambda`

A

1, 2 and 3 are correct

B

1 and 2 are correct

C

) 2 and 4 are correct

D

1 and 3 are correct

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