Which of the following equations represents a travelling wave ?
  • A$y=A \sin (15 x-2 t)$
  • B$y=\operatorname{Ae}^{-x^{2}}(v t+\theta)$
  • C$y=A e^{x} \cos (\omega t-\theta)$
  • D$y=A \sin x \cos \omega t$
JEE MAIN 2021, Easy
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