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Equation of a plane progressive wave is ...

Equation of a plane progressive wave is given by ` y = 0.6 sin 2 (pi) [ t - x /2]`. 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) [ t + x/2]`

B

`y = -0.4 sin 2 (pi) [ t + x/2]`

C

`y = 0.4 sin 2 (pi) [ t +x /2]`

D

`y = -0.4 sin 2 (pi) [ t - x /2]`

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