Equation of a plane progressive wave is given by $y = 0.6\, \sin 2\pi \left( {t - \frac{x}{2}} \right)$.On reflection from a denser medium its amplitude becomes $2/3$ of the amplitude of the  incident wave. The equation of the reflected wave is :-

  • A

    $y = 0.6\sin 2\pi \left( {t + \frac{x}{2}} \right)$

  • B

    $y = -0.4\sin 2\pi \left( {t + \frac{x}{2}} \right)$

  • C

    $y = 0.4\sin 2\pi \left( {t + \frac{x}{2}} \right)$

  • D

    $y =  - 0.4\sin 2\pi \left( {t - \frac{x}{2}} \right)$

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