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Consider the three waves

${z_1},{z_2}$ and ${z_3}$ as${z_1} = A\sin (kx - \omega \,t)$, ${z_2} = A\sin (kx + \omega \,t)$ and ${z_3} = A\sin (ky - \omega \,t)$.

Which of the following represents a standing wave

  • A${z_1} + {z_2}$
  • B${z_2} + {z_3}$
  • C${z_3} + {z_1}$
  • D${z_1} + {z_2} + {z_3}$
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