Figure given below shows four progressive waves $A, B, C$ and $D$ with their phases expressed with respect to the wave $A$ . It can be calculated from the figure that
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It is clear from figure that the wave $A$ attains its mean position $T/4\,times$ earlier than $C$ , i.e., $C$ lags behind $A$ by phase angle $\pi /2$ . Further, $B$ attains the mean position $T/4\,times$ earlier than $A$ , i.e., $B$ is ahead by a phase angle of $\pi /2$
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