Question

Types of surface needed for reflection of sound waves are :-
a. smooth surface only b. polished and smooth surface
c. polished and rough surface d. rough and hard surface only

Answer 1

polished and smooth surface

Answer 2

Answer:

The surface types needed for reflection of sound waves are "Polished and rough surface".

Explanation:

• The sound reflection is usually caused by the hitting of sound waves in an obstacle and hence the sound waves are reflected back to the destination and this is called as sound reflection.
• In order for sound refection the incident angle and the reflected wave should be equal to the normal.
• The reflected surface should be ‘polished and rough’ so that the reflection of the sound waves can happen and thereby the “angle of incidence” will be equal to the normal.