Sound WavesHard
Question
P, Q and R are three particles of a medium which lie on the x-axis. A sine wave of wave length λ is traveling 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 : -
Options
A.P and Q is 
B.P and Q is λ
C.P and R is 
D.P and R is λ
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