Question:
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
(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)
Solution:
The correct answer is (b) y = -0.4 sin 2π(t+x/2)