STANDARD Physics Reflection of Waves MCQ 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. The equation of the reflected wave is
y = 0.6 sin 2π (t + x/2)
y = -0.4 sin 2π (t + x/2)
y = 0.4 sin 2π (t + x/2)
y = -0.4 sin 2π (t - x/2)
Correct Answer
Detailed Explanation
Amplitude of reflected wave = (2/3) × 0.6 = 0.4. On reflection from a denser medium there is a phase change of π. Equation of reflected wave is y = -0.4 sin 2π (t + x/2).
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