Two particles $P$ and $Q$ describe $SHM$ of same amplitude $a$ , frequency $v$ along the same straight line. The maximum distance between the two particles is $a \sqrt 2$ . The initial phase difference between the particles is
A
zero
B$\frac {\pi }{2}$
C$\frac {\pi }{6}$
D$\frac {\pi }{3}$
Diffcult
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B$\frac {\pi }{2}$
b $\theta=\frac{\pi}{4}+\frac{\pi}{4}=\frac{\pi}{2}$
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