Answer:
(a)
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.
(b) 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 lock tube.
(c) Laws of reflection:
(i)The angle of incidence is equal to the angle of
reflection.
(ii) The incident ray, the normal to the reflecting
surface at the point of incidence and the reflected ray, all lie in the same
plane.
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