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Equation of motion in the same direction is given by ${y_1} = A\sin (\omega t - kx)$, ${y_2} = A\sin (\omega t - kx - \theta )$. The amplitude of the medium particle will be
  • A$2A\cos \frac{\theta }{2}$
  • B$2A\cos \theta $
  • C$\sqrt 2 A\cos \frac{\theta }{2}$
  • D$\sqrt 2 A\cos \theta $
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