A wave represented by the equation $y_1 = a\,cos(Kx-\omega t)$ is superimposed 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$a\,cos\,(kx \,-\,\omega t \,+\, \pi )$
  • B$a\,cos\,(kx \,+\,\omega t \,+\, \pi )$
  • C$a\,cos\,(kx \,-\,\omega t \,+\, \pi /2)$
  • D$a\,cos\,(kx \,+\,\omega t \,+\, \pi /2)$
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