Two waves are given by ${y_1} = a\sin (\omega t - kx)$ and ${y_2} = a\cos (\omega \,t - kx)$ The phase difference between the two waves is
  • A$\frac{\pi }{4}$
  • B$\pi$
  • C$\frac{\pi }{8}$
  • D$\frac{\pi }{2}$
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