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
1
\(y = 0.6\sin 2\pi \left( {t + \frac{x}{2}} \right)\)
2
\(y = -0.4\sin 2\pi \left( {t + \frac{x}{2}} \right)\)
3
\(y = 0.4\sin 2\pi \left( {t + \frac{x}{2}} \right)\)
4
\(y = -0.4\sin 2\pi \left( {t - \frac{x}{2}} \right)\)