A wave represented by the given equation $y = a\cos (kx - \omega \,t)$ is superposed with another wave to form a stationary wave such that the point $x = 0$ is a node. The equation for the other wave is
  • A$y = a\sin (kx + \omega \,t)$
  • B$y = - a\cos (kx + \omega \,t)$
  • C$y = - a\cos (kx - \omega \,t)$
  • D$y = - a\sin (kx - \omega \,t)$
AIEEE 2002,IIT 1988,AIIMS 1998, Medium
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