A wave motion has the function $y = {a_0}\sin (\omega \,t - kx)$. The graph in figure shows how the displacement $y$ at a fixed point varies with time $t$. Which one of the labelled points shows a displacement equal to that at the position $x = \frac{\pi }{{2k}}$ at time $t = 0$
  • A$P$
  • B$Q$
  • C$R$
  • D$S$
Medium
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