What is meant by reflection of sound?

cbse
sound
cbse-class-9-science

#1

(a) What is meant by reflection of sound?
(b) Describe an activity to study the reflection of sound.
© State the laws of reflection of sound.

Answer:

  1. Reflection is a phenomenon of reversion of a wave going from one medium to the same medium after striking the second medium. Sound wave also experience reflection like other waves.
  2. To observe the reflection of sound, take a drawing board and fix it on the floor. Put two metallic or cardboard tubes as shown in figure. These tubes are making some angle with each other. Put a clock near the end of one tube and a screen between the two tubes so that sound of clock may not be heard directly. The sound (like tick-tick) waves pass through the tube are reflected by the drawing board. The reflected sound waves enter the second tube and are heard by the ear placed in front of the second tube.
  3. Laws of reflection:
  • The angle of incidence is equal to the angle of reflection.
  • The incident ray, the normal to the reflecting surface at the point of incidence and the reflected ray, all lie in the same plane.