Question

For a sound wave, the reflected wave, incident wave and the normal to the reflecting surface always lie ___.

• A. in different planes
• B. in the same plane
• C. in planes perpendicular to each other
• D. incident and reflected waves are in the same plane while normal is in a perpendicular plane

Answer 1

The correct option is B

in the same plane

Sound waves always obey laws of reflection. According to the first law of reflection, the reflected wave, incident wave and the normal to the reflecting surface always lie in the same plane.