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Equation of a plane progressive wave is ...

Equation of a plane progressive wave is given by `y=0.6sin 2pi(t-x/2)`.On reflection from a denser medium its amplitude becomes 2/3 of the ampliude of the incident wave. The equation of the reflected wave is:

A

`y=0.6sin2pi (t+x/2)`

B

`y=-0.4sin2pi (t+x/2)`

C

`y=0.4sin2pi (t+x/2)`

D

`y=-0.4sin2pi (t-x/2)`

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