Question

Mark the correct statements.
(I) directions in which the sound is incident and is reflected make equal angles with the normal to the reflecting surface.
(II) reflection of sound occurs from a polished surface.
(III) reflection of sound occurs from rough surface.

• A. I, II
• B. I, III
• C. II, III
• D. I, II, III

Answer 1

The correct option is D I, II, III

Sound bounces off a solid or a liquid like a rubber ball bounces off a wall. Like light, sound gets reflected at the surface of a solid or liquid and follows the same laws of reflection as you have studied in earlier classes. The directions in which the sound is incident and is reflected make equal angles with the normal to the reflecting surface, and the three are in the same plane. An obstacle of large size which may be polished or rough is needed for the reflection of sound waves.