Q: Equation of a plane progressive wave is given by y = 0.6 sin 2π(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 2π(t + x/2)
(b) y = – 0.4 sin 2π(t + x/2)
(c) y = 0.4 sin 2π(t + x/2)
(d) y = – 0.4 sin 2π(t – x/2)
Ans: (b)